Critical hit multiplier

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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

Common weapons' threat range/multiplier

	18-20	19-20	20
x2	Falchion Kukri Rapier Scimitar Great Crossbow	Heavy Crossbow Light Crossbow Repeating Heavy Crossbow Repeating Light Crossbow Greatsword Bastard Sword Longsword Shortsword Dagger Throwing Dagger Dart Shuriken	Dart Club Greatclub Heavy Mace Kama Light Hammer Light Mace Morningstar Quarterstaff Sickle Unarmed
x3		Khopesh	Battleaxe Dwarven axe Greataxe Handaxe Throwing Axe Longbow Shortbow Warhammer Maul
x4			Heavy Pick Light Pick

Ways to increase multiplier

• Competence bonus to critical hit multiplier can come from various sources. Multiple effects granting competence bonus don't stack.
  • Vile Chemist: +1 critical range and multiplier for Simple Weapons while wielding a Simple Weapon, Orb, Rune Arm, or nothing in your off hand.
  • Artificer's Battle Engineer capstone: +1 for Crossbows, Bastard Swords, Dwarven Axes, Light Hammers, Warhammers, and Morningstars.
  • Focused Wrath - Frenzied Berserker enhancements T5: +1 / +2
  • Occult Metalline - Occult Slayer enhancements T5: +1
  • Bard's Swashbuckling enhancement modifies the threat / multiplier as follows
    • Dagger, Shortsword, Throwing Dagger: +1 Threat, +1 Multiplier
    • Light Mace, Light Hammer, Kama, Sickle, Dart, Shuriken, Throwing Axe, Throwing Hammer: +2 Threat, +1 Multiplier
    • Kukri, Rapier: +1 Multiplier
    • Handaxe: +2 Threat
    • Light Pick: +1 Threat
  • Kensei's 3rd core: +1
  • Paladin spell: Holy Sword: +1 to threat and multiplier for all weapons (not shields). Also War domain cleric SLA.
  • Staff Specialization, available for Rogues and Monks, add +1 to threat and multiplier for quarterstaves
  • Knife Specialization, available for Assassins, adds +1 multiplier for daggers and kukris. Additionally, it adds +1 to threat for daggers.
  • Expert Builder, available for Mechanics, adds +1 multiplier for bows, crossbows, and thrown weapons; +2 for great crossbows.
  • Deflect Arrows available for Tempests, add +1 multiplier while dual wielding weapons (not handwraps).
  • Ninja Master, available for Ninjas, adds +1 multiplier while centered.
  • Empty Hand Mastery of Shintao monks adds +1 for Handwraps

• Morale bonus
  • Knight's Training: +1 for Long Swords

• Insight bonus
  • Lethality, available for Assassins, adds +1 multiplier for any one-handed weapon you are wielding (Two Weapon Fighters will get the bonus for both weapons provided they qualify).
• Sacred bonus
  • Destroyer of the Dead: Clubs, Light Maces, Heavy Maces, and Morningstars you wield gain a +1 Sacred Bonus to Critical Multiplier.

• Vanguard's 5th core ability increases the threat range and multiplier of your shield by 1.

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.

Bug: None of the multiplier increasing effects work on thrown weapons. (Update: Probably already fixed!)

Ways to increase multiplier on 19 and 20

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

• Howl of the North - Warchanter enhancements T5: +1
• Death Frenzy - Frenzied Berserker enhancements 5th core: +1
• Bond of Retribution - Occult Slayer enhancements T3: +1 when below 50% HP
  • Bond of Destruction T5 removes the health requirement
• Monks in Greater Sun Stance or Ultimate Sun Stance: +1 for monk weapons and unarmed attacks
• Devastating Critical - Legendary Dreadnought: +1
• Headman's Chop - Legendary Dreadnought: +1 if you have an axe in main hand
• Overwhelming Critical epic feat: +1
• Renegade Champion item set: +1