Critical hit multiplier

The critical hit multiplier is the number by which the base damage is multiplied upon a confirmed critical hit. Not to be confused with critical threat - which refers to how likely you are to land a critical hit. It also affects various damage effects coming from specific weapon enhancements;

• Bursting effects
  • Elemental Burst
  • Holy Burst, Unholy Burst
  • Good Burst, Evil Burst
• Maiming

Ways to increase multiplier

• Competence bonus to critical hit multiplier can come from various sources. Multiple effects granting competence bonus don't stack.

Sources of Competence Bonus

Source	Tier/Core	Enhancement Name	Bonus amount	Compatible Weapons
Assassin enhancements	T5	Knife Specialization	+1	Dagger, Kukri
Arcane Archer enhancements	Core 5	Shadow Arrows	+1	Shortbows, Longbows
Battle Engineer enhancements	Core 4	Infused Weapons II	+1	Crossbows, Bastard Sword, Dwarven Axe, Light Hammer, Warhammer, Morningstar
Dark Hunter enhancements	T5	Blade Specialization (Multiplier)	+1	All Weapons
Dragon Disciple enhancements	T5	Peace in Destruction	+1	All Weapons while Centered
Dragon Lord enhancements	T5	Conqueror	+1/2	All Weapons
Frenzied Berserker enhancements	T5	Focused Wrath	+1/2	All Weapons
Henshin Mystic enhancements	T5	Mystic Honing	+1	All Weapons while Centered
Horizon Walker enhancements	T5	Feywild Attunement	+1	Shortbow, Longbow
Inquisitive enhancements	Core 4	True Seeing	+1	Light Crossbow, Heavy Crossbow
Kensai enhancements	Core 3	Strike with No Thought	+1	All Weapons
Mechanic	Core 5	Expert Builder	+1	Bows, Crossbows and Throwing weapons
Mechanic	Core 5	Expert Builder	+2	Great Crossbows
Nature's Warrior enhancements	Core 4	A True Hunter	+1	All Weapons while in Wolf or Bear form
Ninja Spy enhancements	T5	Deadly Striker	+1	All Weapons while Centered
Occult Slayer enhancements	T5	Occult Metalline	+1	All Weapons
Paladin Spell Level 4 / Cleric War Domain	Spell	Holy Sword	+1	All Weapons
Shintao enhancements	T5	Empty Hand Mastery	+1	All Weapons while Centered
Sorcerer Eldritch Knight enhancements	T5	Improved Knight's Transformation	+1	Melee Weapons
Swashbuckler enhancements	Core 2	Swashbuckling	+1	Light Weapons (EXCEPT Handwraps, Handaxe, Light Pick), Rapier, Kama, Throwing Weapons
Tempest enhancements	Core 4	Deflect Arrows	+1	All Weapons while wielding two weapons
Thief-Acrobat enhancements	Tier 5	Staff Specialization	+1	Quarterstaff
Vanguard enhancements	Core 5	Vicious Shield	+1	Shields
Vile Chemist enhancements	Core 5	Hidden Blades III	+1	Simple Weapons in mainhand, with a simple weapon, orb, runearm or nothing in offhand
Vistani Knife Fighter enhancements	Core 4	Plays with Knives	+1	Daggers, Kukri, Throwing Daggers
War Soul enhancements	T5	Divine Power	+1	Favored Weapon
Wizard Eldritch Knight enhancements	T5	Improved Knight's Transformation	+1	Melee Weapons

• Morale bonus
  • Knight's Training feat: +1 with Long Swords.

• Insight bonus
  • Assassin enhancements core 5: +1 with one-handed weapons (dual wielders will get the bonus for both weapons, provided they qualify.)

• Sacred bonus
  • Scourge enhancements T4 - Destroyer of the Dead: +1 with clubs, light maces, heavy maces, and morningstars.

• Primal
  • Razorclaw Shifter enhancements T4 - Overwhelming Shifting: +1 with handwraps while under the effects of Razorclaw Shift.

• Untyped (stacking)
  • Patience epic feat: +1
  • Combat Archery epic feat: +1 for Longbows and Shortbows

Many active attacks, often coming from enhancements, feats, or epic destiny abilities, modify the critical threat and/or multiplier of a single attack. These effects usually stack with everything else.

Ways to increase multiplier on 19 and 20

Multiple ways exist now to increase critical multiplier on the rolls of 19 and 20. All of these fully stack.

Heroic

• Frenzied Berserker enhancements core 5: +1
• Occult Slayer enhancements T3 - Bond of Retribution: +1 when below 50% HP (T5 Bond of Destruction removes the health requirement.)
• Warchanter enhancements T5 - Howl of the North: +1
• Monks in Greater Sun Stance or Ultimate Sun Stance: +1, exits stance if uncentered.

Epic

• Divine Crusader T5 - Blessed Blades: +1 with favored weapons.
• Fatesinger T5 - Blade Song: +1 with all weapons (except handwraps and animal forms.)
• Grandmaster of Flowers T5 - Imposing Force: +1 while centered.
• Legendary Dreadnaught T5 - Overpower multiselector: +1 with the selected weapon type.
• Overwhelming Critical epic feat: +1

Items

• Blunt Trauma weapons: +1
• Elasticity bows: +1
• Renegade Champion item set: +1
• Fried & Frozen Frenzy item set: +1
• Last Line of Defense item set: +1