Thief is Mewgenics’ fast positioning and critical-hit class. It starts with unusually high Speed, attacks at range with Nail Throw, and has multiple ways to turn getting behind enemies, landing critical hits, collecting coins, or hitting several times into a full build.
The class becomes much stronger once I stop treating movement as something I spend just to reach attack range.
For Thief, movement is often part of the damage setup.
Quick answer: Thief works best when the build chooses one payoff for all that Speed. Backstabber and Shank reward getting behind enemies. Critical and Pinpoint reward repeated crits. Double Throw turns one basic attack into several hit-effect triggers. Golden Claws and Swift Looter turn coins into combat scaling. The weak Thief is the one collecting pieces from all four directions without enough support for any of them.
Thief at a Glance
| Thief Trait | Value |
|---|---|
| Role | Crit damage / mobility / backstabs / pickups |
| Stat bonuses | +4 Speed, +1 Luck |
| Stat penalties | -1 Strength, -1 Constitution |
| Basic attack | Nail Throw |
| Basic attack power | 5 Physical Damage |
| Attack type | Ranged straight-line attack |
| Best at | Repositioning, crit chains, backstabs, multi-hit effects, coin scaling |
| Main weakness | Lower Constitution and builds that require specific positioning |
| Unlock | Clear The Sewers |
The stat spread explains a lot about the class.
Thief gets a large Speed bonus and some Luck, but gives up Strength and Constitution. That makes it much better at finding the correct attack angle than standing in place and trading damage.
The class can still deal very high burst, but the route to that damage usually comes through positioning, crits, or repeated hits, not raw starting Strength.
How to Unlock Thief
Thief unlocks by clearing The Sewers.
The Sewers route can be dangerous because the area and its encounters reward careful spacing. The unlock material specifically calls out Electric damage as useful there and warns that the Boris fight can become rough if the party bunches up.
So this is not a separate hidden quest.
Finish The Sewers and Thief becomes available.
Thief Basic Attack: Nail Throw
Thief’s basic attack is Nail Throw.
It deals 5 Physical Damage to a unit in a straight line.
This matters because many Thief passives modify the basic attack rather than replacing the whole class with expensive spells.
Double Throw changes the number of hits.
Weak Spot makes it ignore Shield and apply Weakness.
Shank changes it into a multi-hit melee backstab when Thief is directly behind a target.
That means Nail Throw should not be evaluated only by its base five damage.
The basic attack can become the delivery system for the entire build.
Thief Is a Positioning Class Before It Is a Crit Class
Crit is the obvious Thief theme, but the harder part is usually getting the attack you actually want.
A normal Nail Throw can work from range.
A Shank setup wants Thief behind and adjacent to the enemy.
Assassinate can only attack from behind.
Shadow teleports Thief directly behind a unit.
Distract can make a target face away.
Backstabber guarantees crits on backstabs.
These pieces all point toward the same gameplay loop:
create the angle → get behind the target → convert the position into a crit or multi-hit attack → use the result to move again
That is much more specific than simply stacking Luck.
Key Thief Active Abilities
Thief has a large ability pool, so these are the ones that best show its main build directions.
| Ability | Cost | Core Effect | Practical Role |
|---|---|---|---|
| Shadow | 4 Mana | Teleport behind a unit | Backstab setup |
| Assassinate | 8 Mana | 10-damage melee attack from behind, ignores Shield, +50% crit chance | Backstab burst |
| Nail Flurry | 10 Mana | Throw ten 1-damage nails that ignore Shield | Multi-hit / crit payoff |
| Poison Nail | 3 Mana | Low-damage nail that inflicts Poison and ignores Shield | Poison setup |
| Steal Time | 4 Mana | Weak melee hit; a crit refreshes movement and basic attack | Crit action loop |
| Coin Toss | 0 Mana initially | Throw a coin for 10 Physical Damage; reload by collecting a coin | Coin engine |
| Eagle Eye | 4 Mana | Spawn several coins on random tiles | Coin generation |
| Greedstep | 4 Mana | Teleport to a coin tile | Coin-driven mobility |
These abilities make it clear that Thief is not one build.
Shadow and Assassinate want positional burst.
Nail Flurry wants effects that reward many hits or crits.
Poison Nail wants status scaling.
Coin Toss, Eagle Eye, and Greedstep create an entirely separate coin economy.
Shadow: Position First, Attack Second
Shadow costs 4 mana and teleports Thief behind a unit.
The upgraded version also gives the next action +100% crit chance.
This solves the hardest part of a backstab build directly.
Instead of spending normal movement to circle an enemy, Shadow creates the correct attack angle immediately.
That makes the following action more important than Shadow itself.
If the next action is Assassinate, Shank, or another backstab payoff, the 4 mana created an attack that may not have been possible otherwise.
If I teleport behind an enemy and then use an action that did not care about being behind it, I probably wasted the best part of the spell.
Assassinate: The Target Must Expose Its Back
Assassinate is a 10-damage melee attack that can only be used from behind.
It ignores Shield and has 50% crit chance.
The upgraded version reaches 100% crit chance and costs less mana.
This is exactly the kind of ability that shows why positioning matters more than theoretical damage.
Ten damage plus a likely crit is excellent.
Ten damage that cannot be cast because the boss has no accessible back is zero.
The Thief build therefore needs a second plan for fights where backstabbing is difficult or impossible.
Nail Flurry: Ten Hits Change What a Crit Build Wants
Nail Flurry costs 10 mana and throws ten 1-damage nails that ignore Shield.
The upgraded version throws additional nails based on Dexterity.
The total base damage is useful, but the hit count is the more interesting part.
A passive that rewards critical hits can potentially benefit repeatedly from a spell that makes many separate attacks.
The same applies to effects that care about on-hit statuses.
This is why Pinpoint and other crit-trigger mechanics become much more attractive once Nail Flurry enters the pool.
Nail Flurry itself is unlocked by completing The Caves with Thief.
Steal Time: Crit Can Give Thief Another Action
Steal Time costs 4 mana and makes a weak melee attack.
If it crits, Thief refreshes both its basic attack and movement action.
The upgraded version also gains +30% crit chance.
The one damage is not the point.
This is an action-economy spell.
A successful crit can effectively turn:
Steal Time → refreshed movement → reposition → another basic attack
into one extended turn.
That makes crit chance valuable for a completely different reason than just multiplying damage.
The crit is generating actions.
Poison Nail: Damage Is Not the Point
Poison Nail costs 3 mana.
It deals only 1 Physical Damage, but it inflicts Poison and ignores Shield.
The upgraded form throws two nails.
This is another ability where the base damage is deliberately misleading.
I take Poison Nail when the build cares about Poison application, not because one point of damage is impressive.
It becomes much more attractive once repeated hits, Poison scaling, or longer boss fights give those stacks enough time to matter.
Coin Toss: Coins Can Become Combat Resources
Coin Toss starts at 0 mana and deals 10 Physical Damage.
To reload it, Thief has to collect a coin.
Repeated uses in the same turn become more expensive, and the upgraded version gains infinite range, +50% crit chance, and Shield penetration.
This creates a very different interpretation of coins.
Coins are no longer just something to pick up after the fight.
They can become ammunition.
That immediately makes coin generation and movement-to-coin effects more valuable.
Eagle Eye and Greedstep
Eagle Eye spends 4 mana to spawn 2 to 3 coins on random tiles.
The upgraded version spawns 3 to 7.
Greedstep teleports Thief to a tile containing a coin.
The upgraded form also creates additional coins afterward.
Together, these abilities can turn the board into a movement network.
The coin is simultaneously:
- a pickup;
- a potential Coin Toss reload;
- a Greedstep destination;
- a trigger for coin-based passives.
That is when a coin build becomes an actual combat engine instead of an economy gimmick.
Thief Passives That Define Builds
| Passive | Core Effect | What It Changes |
|---|---|---|
| Critical | Crits deal +100% damage and grant +1 Luck | Self-scaling crit engine |
| Backstabber | Backstabs always crit | Removes RNG from positional damage |
| Shank | Behind and adjacent, basic attack becomes a 2-hit melee attack | Turns positioning into multi-hit burst |
| Pinpoint | Crits inflict Marked | Makes every crit improve follow-up damage |
| Double Throw | Basic attack hits twice for half damage | Multiplies hit-effect triggers |
| Weak Spot | Basic attack ignores Shield and inflicts Weakness | Shield-breaking basic attack |
| Golden Claws | Gain Damage for every coin collected | Converts pickups into scaling |
| Swift Looter | Coins refresh movement and extra coins spawn | Converts pickups into mobility |
| More! | Kills refresh movement | Creates kill-chain movement |
| First Strike | Extra opening turn | Gives Thief immediate setup tempo |
These passives are useful because they tell me what resource the current Thief actually values.
Backstabber values position.
Critical values crit frequency.
Golden Claws values coin generation.
More! values reliable kills.
Double Throw values effects that trigger per hit.
Critical: The Crit Engine Feeds Itself
Critical makes critical hits deal 100% additional damage.
Every crit also gives Thief +1 Luck.
The upgraded version additionally inflicts Bleed and Weakness on crits.
This is one of the cleanest Thief scaling engines because successful crits make future crits easier.
The loop is:
crit → gain Luck → improve future crit consistency → crit again
It does not require a specific backstab angle, coin engine, or Poison setup.
That makes Critical one of the easiest passives to build around once the run already has several multi-hit or high-crit attacks.
Backstabber Removes the Most Important Backstab RNG
Backstabber makes all backstabs automatically critical.
The upgraded version also grants a random stat increase whenever Thief lands a critical hit.
This changes the backstab calculation completely.
Normally I need both:
get behind the enemy
and:
roll the crit
Backstabber removes the second requirement.
Now positioning itself guarantees the crit.
That makes Shadow, Assassinate, Distract, Shank, and other backstab tools much more reliable.
Shank: Nail Throw Becomes a Different Attack
Shank changes Thief’s basic attack when Thief is behind and adjacent to an enemy.
Instead of Nail Throw, the basic attack becomes a melee attack that hits twice.
The upgraded version hits three times.
That means Shank is not just a damage bonus.
It changes how I position the entire class.
A normal Thief can stay at range.
A Shank Thief actively wants to enter melee range, get behind the target, and convert one basic action into multiple hits.
The downside is obvious: some enemies and bosses do not give you a practical backstab position.
So Shank needs a fallback.
Pinpoint: Crits Create Marked
Pinpoint makes critical hits inflict Marked.
The upgraded version also makes critical hits deal 100% more damage.
This becomes especially interesting with attacks that can crit multiple times.
Nail Flurry is the obvious example.
Steal Time also likes crit support because the crit refreshes actions.
Pinpoint therefore works best on a Thief that is already producing crits reliably.
It is much weaker if the build has only one low-crit attack each turn.
Double Throw: Half Damage Is Not Necessarily a Downgrade
Double Throw makes the basic attack hit twice at half damage.
The upgraded version hits three times at one-third damage.
If all I care about is one normal five-damage Nail Throw, that may initially look like no improvement.
But the purpose is the number of hits.
Each hit can potentially interact with effects attached to attacks.
That makes Double Throw much more valuable in Poison and other on-hit builds than in a build where every attack only cares about one large damage number.
The gameplay material specifically highlights this interaction with Poison-heavy setups.
Weak Spot: Useful, but Not Automatically the Best Crit Tool
Weak Spot makes the basic attack ignore Shield and inflict Weakness 1.
The upgraded version applies the effect to all damaging abilities, raises Weakness to 2, and adds +25% crit chance.
This is useful in areas where Shield is a major obstacle.
But Thief already has several attacks that ignore Shield, and critical hits can also provide another way around defensive problems.
So I would not automatically take Weak Spot just because it sounds perfectly suited to Thief.
Its value rises when Shield is the specific thing stopping the current build.
Golden Claws and Swift Looter: The Coin Engine
Golden Claws gives Thief +1 Damage for every coin collected.
The upgraded version gives +2 Damage per coin.
Swift Looter makes coin pickups refresh Thief’s movement action and also spawns extra coins in battle.
The upgraded version additionally gives +1 Dexterity and +1 Speed whenever a coin is collected.
This is where the coin build becomes much more serious.
A coin can now provide:
damage scaling + movement refresh + stats + Coin Toss reload + Greedstep destination
But the build needs enough coin generation.
Taking Golden Claws with no reliable way to create or reach coins leaves the main passive underfed.
This route is strongest when several coin pieces appear together.
More!: A Kill Can Continue the Turn
More! refreshes Thief’s movement action whenever Thief kills a unit.
The upgraded version refreshes both movement and the basic attack.
This is one of the cleanest snowball passives on the class.
A Thief that can reliably finish a weak unit can:
kill → refresh movement → reposition → attack again
That can continue converting one successful kill into the next.
But the passive needs kill control.
If another cat keeps taking the last hit, More! does nothing.
First Strike: The Opening Turn Can Decide the Setup
First Strike gives Thief an extra turn at the start of battle.
The upgraded version guarantees that damage dealt during that turn is critical.
That is particularly useful for builds that need to establish something immediately.
A backstab Thief can reposition before enemies act.
A crit Thief can start building Critical or Pinpoint value.
A dangerous priority target can be pressured before the fight develops.
The extra turn is valuable because Thief is already a class that converts movement and attacks into additional opportunities.
Best Thief Build Directions
Thief has several distinct engines. I would not try to build all of them in the same run.
Backstab Crit Thief
The core pieces are:
- Backstabber;
- Shank;
- Shadow;
- Assassinate;
- other behind-target tools.
The goal is to remove crit RNG by making the attack itself a backstab.
Shadow is particularly useful because it solves the positioning requirement directly.
This direction becomes weaker against targets where getting behind them is impractical.
General Crit Thief
This route cares less about backstabs and more about producing as many reliable critical hits as possible.
Critical and Pinpoint are the strongest examples.
Nail Flurry becomes attractive because ten separate hits create many crit opportunities.
Steal Time can convert one successful crit into refreshed actions.
This build is much less dependent on enemy facing than Shank or Assassinate.
Poison Multi-Hit Thief
Double Throw changes one basic action into several hits.
Poison Nail provides cheap Shield-ignoring Poison.
Other Poison-on-hit effects become much stronger as the number of attacks increases.
This direction is particularly interesting against durable enemies because the build does not need every individual hit to be large.
It wants repeated applications.
Coin Scaling Thief
The important pieces are:
- Golden Claws;
- Swift Looter;
- Eagle Eye;
- Greedstep;
- Coin Toss;
- other coin generation.
The strongest version creates a loop where coins improve damage, restore movement, change positioning, and reload attacks.
The weak version has Golden Claws but only picks up a few coins per battle.
Coin generation is what separates the two.
Kill-Chain Thief
More! is the center of this build.
Thief wants enough damage to finish one target consistently, then use the refreshed movement or basic attack to reach the next target.
Critical damage and First Strike fit naturally because they make the first kill easier.
The main limitation is boss fights or low-enemy-count encounters where there are fewer kill resets available.
Thief Failure States
| Failure State | What Actually Went Wrong |
|---|---|
| Building Shank without reliable back access | Your best basic attack condition rarely activates |
| Using Shadow with no backstab payoff | You paid mana for position without converting it into enough value |
| Taking Golden Claws with no coin generation | The damage passive barely scales |
| Taking Double Throw with no hit effects | You split the attack without gaining enough from the extra hits |
| Using Steal Time with poor crit chance | The one-damage attack often fails to refund the actions |
| Stacking crit damage but not crit chance | Powerful crit effects do nothing when attacks do not crit |
| Relying only on backstabs against bosses | Some targets make the required position difficult or impossible |
| Letting teammates take every finishing blow with More! | Thief never receives the movement or attack refresh |
| Collecting coins that pull Thief into danger | The pickup engine creates bad positioning instead of tempo |
The recurring Thief mistake is chasing the payoff while ignoring the setup condition.
A backstab passive is only strong when Thief can get behind something.
A coin passive is only strong when coins actually appear.
A crit-trigger passive is only strong when attacks actually crit.
What I Look for During a Thief Run
If I see Backstabber, I immediately value Shadow, Shank, Assassinate, and facing control more highly.
If I see Critical, I want multi-hit attacks and additional crit chance because every successful crit improves the next one.
If I see Pinpoint, Nail Flurry and other repeated-hit attacks become much more attractive.
If I see Double Throw, I start checking for Poison and other per-hit effects.
If I see Golden Claws, I do not commit until I know the run can generate enough coins.
If I see Swift Looter, coins become movement resources instead of optional pickups.
If I see More!, I start planning which enemy Thief can reliably finish first.
The right Thief build usually reveals itself through the first strong payoff passive.
Is Thief Worth Using?
Thief is strongest when movement, crits, and attacks are feeding each other instead of functioning as separate systems.
A backstab Thief uses Speed to create guaranteed crits.
A Critical Thief uses repeated crits to gain more Luck.
A Steal Time Thief uses crits to generate more actions.
A coin Thief uses pickups to generate movement and damage.
A Poison Thief uses multi-hit attacks to multiply status application.
That is the real identity of the class:
Thief is not just fast. It turns good positioning or one successful trigger into another action, another crit, or another scaling opportunity.