The Witcher: Monster Slayer Damage Calculator
Enter your base attack power, choose your sword school, select the oil you apply before battle, and pick your skill bonuses to see how much effective damage each attack type deals. The calculator covers quick attacks, strong attacks, critical hits, and sign damage, showing the full breakdown of every multiplier so you know exactly why each number lands where it does.
How damage works in The Witcher: Monster Slayer
Every attack in Monster Slayer starts from a single stat: your base attack power (AP). That number comes from your player level and the gear you equip, and it scales upward as you progress. The game then applies a chain of multipliers to that base: the oil you coated your blade with before the fight, any sword-school passive bonus from your equipped weapon, active skill bonuses from your three skill trees, and potion effects tied to real-world time or weather. Quick attacks fire rapidly and benefit from Feline school swords and the Muscle Memory combat skill. Strong attacks hit harder per swing and scale with Ursine school swords and the Strength Training skill. Critical hits consume the golden meter that charges during combat and deal double base damage by default, rising to 2.5x with a Caerme school sword. Signs, such as Igni and Aard, draw on a fraction of your AP amplified by Griffin school swords and signs-tree skills.
Oils are the single biggest damage lever
Before you enter any fight, check the bestiary for the creature you are about to face and apply the matching oil. Basic Oil adds 33% damage against any monster - useful when you are out of specialized supplies - but the ten specialized oils each add 100% damage against their category. That is three times the bonus of Basic Oil for no extra cost if you carry the right one. Necrophage Oil covers Ghouls and Drowners. Specter Oil handles Wraiths and Barghests. Hybrid Oil works against Harpies and Griffins. The oil effect lasts the entire battle and stacks multiplicatively with sword-school bonuses, so a Feline sword on a Specter target with Specter Oil does not add the bonuses together: it multiplies 1.15 by 2.0 for a 2.3x total. Identifying monster categories in the bestiary before each encounter is the fastest skill improvement available in the game.
Choosing your attack type and sword school
The right attack type against a given monster makes a material difference to how fast you drain its health bar. Some monsters resist slow, powerful hits but are staggered easily by quick chains; others shrug off rapid strikes but are vulnerable to a single crushing blow. Your sword school locks in a passive bonus for the life of that weapon: Feline school gives 15% extra quick attack damage, Ursine gives 15% extra strong attack damage, and Caerme gives 50% more critical hit damage, which raises the crit multiplier from 2.0x to 2.5x. The Wolven school speeds up how fast the critical meter charges by 10%, which is strong in long fights where you fire the meter several times. Griffin and Manticore schools benefit sign-heavy builds. You cannot switch sword school mid-fight, so choose a sword that matches how you naturally play and what monster type you are farming that session.
Stacking potions and weather bonuses
The Alchemy skill tree unlocks potion slots and two particularly powerful situational effects. Cat Potion adds 75% damage during nighttime encounters. Squall Potion adds 75% damage when real-world rain is detected. Both activate from real-world conditions through your device's location and clock, so a rainy night is the optimal window to farm legendary encounters. Crucially, these multipliers stack multiplicatively with each other and with oils: on a rainy night with Vampire Oil against a legendary Alp, your total multiplier before any sword or skill bonuses is already 2.0 x 1.75 x 1.75 = 6.125. Unlock Acquired Tolerance and Fast Metabolism in the Alchemy tree to carry more potions into each fight, ensuring you never run out during a legendary contract.
Oil Types and Their Target Monster Categories
| Oil | Bonus | Target Monsters |
|---|---|---|
| No Oil | x1.00 | No bonus |
| Basic Oil | +33% | All monster types |
| Necrophage Oil | +100% | Ghouls, Drowners, Water Hags |
| Cursed Oil | +100% | Archespores, Giant Toads, Werewolves |
| Ogroid Oil | +100% | Nekkers, Cyclops, Rock Trolls |
| Relict Oil | +100% | Fiends, Shaelmaar, Spriggans |
| Hybrid Oil | +100% | Harpies, Succubi, Griffins |
| Insectoid Oil | +100% | Kikimores, Aracnomorphs, Endregas |
| Draconid Oil | +100% | Wyverns, Rarashas, Basilisks |
| Specter Oil | +100% | Barghests, Wraiths, the Voiceless |
| Elemental Oil | +100% | Pixies, Gargoyles, Golems |
| Vampire Oil | +100% | Alps, Ekimmaras, Fledders |
Specialized oils provide 100% bonus damage against their matched category. Basic Oil provides 33% against all monsters.
Frequently asked questions
What is the difference between Basic Oil and specialized oil?
Basic Oil coats your blade with a 33% damage bonus against any monster. Specialized oils are crafted for a specific monster category (Necrophage, Specter, Draconid, etc.) and provide a 100% damage bonus, exactly doubling your output against matching creatures. The bonus from specialized oil is three times larger than Basic Oil, so identifying monster categories in the bestiary and preparing the right oil before each fight is the most impactful preparation habit you can build.
How does the critical hit meter work?
The golden bar above your opponent's health bar charges as you land successful hits. The more consistent your attack rhythm - fast attacks, strong attacks, and timely parries - the faster it fills. Landing a perfect parry preserves the meter while an unguarded hit from the monster completely resets it, so defensive play is essential when you are close to a critical. When you trigger the critical hit, the base damage multiplier is 2.0x. Equipping a Caerme school sword raises that to 2.5x, and any active oil and potion bonuses still apply on top.
Which sword school should I use?
It depends on your preferred play style and the encounters you face most often. Feline rewards aggressive quick-attack chains and pairs well with the Muscle Memory combat skill. Ursine rewards patient timing and pairs with Strength Training. Caerme is the best choice for players who consistently fill the critical meter before firing it, since the 50% crit bonus lifts the multiplier to 2.5x. Griffin is the best pick if you invest in the signs skill tree and cast signs frequently. Wolven is strong in lengthy fights with multiple crit cycles, since the 10% faster meter charge means you fire it more times per battle.
Do Cat Potion and Squall Potion stack?
Yes, and they stack multiplicatively. Cat Potion provides a 1.75x multiplier during night fights. Squall Potion provides another 1.75x during rain. If both conditions are active simultaneously, they combine for 1.75 x 1.75 = 3.0625x, nearly tripling your base damage from potions alone. This stacking occurs on top of any oil and sword-school bonuses already in effect, meaning a legendary nighttime rainy encounter is the ideal moment to use your best oils and consumables.
How does sign damage scale?
Signs use your attack power as their base but apply at a reduced fraction compared to sword strikes. The Griffin school sword adds 30% sign strength on top of that base, and skills in the signs tree (such as Focus, which slows time to help you land more sign-augmented combos) further improve their value. Signs do not benefit from oil bonuses in the same way melee attacks do, so sign-focused builds should still oil their blade for the sword hits they mix in between casts.
What does Quen Discharge do?
Quen Discharge is a signs skill that causes your Quen shield to deal damage to the attacking monster when the shield breaks. At level 1 it reflects 10% of incoming damage; at level 3 that rises to 30%. The reflected damage comes from the enemy's own strike power, so it is most valuable in fights where the monster hits hard and frequently. Pair it with the Resolve skill, which reduces how much your critical meter drains when you take an unparried hit, to create a defensive build that punishes the monster for every attack it lands.