Immunity: Fear, Frightened, Charm, Unconscious, Exhausted, Stunned, Incapacitated, Petrified, Poisoned, Poison


Resistance: Slashing, Piercing, Bludgeoning, Fire


Advantage: Strength, Dexterity, Constitution


Proficiency: Strength, Dexterity, Constitution, Stealth, Perception


Expertise: Stealth, Perception


Magic Resistance: Has Advantage on Saving Throws against spells and other magical effects.


Night Walker: Can't be Enwebbed, Entangled, or Ensnared and can't slip on Grease or Ice.


Immutable Form: +25 Saving Throw Bonus against Polymorph effects, +10 Saving Throw Bonus against Banishment.


Assassin Initiative: You are deadliest against unprepared enemies. In combat, you have Advantage on Attack Rolls against creatures that haven‘t taken a turn yet.


Assassin Ambush: Any successful Attack Roll against a Surprised creature is a Critical Hit.


Fast Hands: Gain an additional Bonus Action


Feral Instinct: You have honed your instincts to the utmost degree. You gain a +3 bonus to Initiative and can't be surprised.


Devil's Sight: You can see normally in darkness, both magical and nonmagical, to a distance of  24m.


Aura Of Murder: Enemies within 3m become Vulnerable to Piercing damage, unless they are Resistant or lmmune to it.


Rending Claws: Ignore Slashing Resistance/Immunity. 


Ignore Fall Damage


15m Movement


x2 Jump Distance


+5 Spell Save DC


+3 Attack Bonus


-3 Critical Threshold


+1 Action/Reaction


level 8- Stats: 


Strength: 25
Dexterity: 18
Constitution: 17
Intelligence: 10
Wisdom: 12
Charisma: 15
AC: 16
Vitality: 113


level 9+ Stats:


Strength: 27
Dexterity: 20
Constitution: 19
Intelligence: 14
Wisdom: 16
Charisma: 19
Vitality: 173


Piercing Growl: Unlocked by default and now costs a bonus action. Damage changed to 4d6+Strength modifier.


MultiAttack: Damage now includes Strength modifier by default(1d4+Strength). Bleeding now increases the damage to 1d8+Strength.


Bhaal's Boon: On killing an enemy marked by Let The Slaughter Begin, gain Advantage on Attacks against Bleeding enemies.


Hunger of The Slayer: Upon taking the form of The Slayer, gain the Hunger of The Slayer passive which transforms you when taken below 20% health, can be removed with Long Rest.


Let The Slaughter Begin: Now a 15m radius and applies Dazed for 2 turns.


All abilities scale from SpellSaveDC.


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I made these changes to work in tandem with the Death Soul - Sorcerer Subclass. - Death Soul - Sorcerer Subclass at Baldur's Gate 3 Nexus - Mods and community (nexusmods.com)



Possible only thanks to Null93 - Free and powerful slayer (Automatic transformation when low hp) at Baldur's Gate 3 Nexus - Mods and community (nexusmods.com) Thank You <3