Assassin Cleric Dual-class BG2: Maximum Backstab Damage

Assassin Cleric Dual-class BG2

The above screencap depicts an authoritative Core Rules damage calculation.

Assassin 21 Cleric 32 is a Baldur's Gate build in BioWare's cRPG of 2000, Baldur's Gate 2.

Build is Assassin (21) → Cleric (32) dual-class Baldur's Gate. The gimmick is septuple multiplier of assassin + Righteous Magic of cleric (which buffs Strength and maximizes the weapon roll).

I'm only interested in unaided damage (no buffs from other combat units).

If the target somehow survives the backstab, it may still incur 30 poison damage + knockback (unconsiousness).

Backstab damage = weapon roll + weapon enchantment + weapon proficiency * backstab level (+ Strength bonus).

• Damage sources (some are multiplied; others only added):

• Staff of the Ram BG2 [STAF22]: 18 (1d6 +6 +12 +1d4) (max 28)
• Proficiency +0 
• Gauntlets of Weapon Expertise BG2 [BRAC10]: +2 (erroneously cannot wear GoES)
• Chant: +1 (doesn't factor)
• Strength 25: +14 (DUHM + Righteous Magic)
• Backstab x7
• Critical x2

Therefore:

Backstab damage = weapon roll [max 6] + weapon enchantment [6] + weapon proficiency [0] + weapon damage bonus [12] * backstab level [7]
+ Strength bonus [14]

Maximum Melee Damage BG1	Kensai Kai Damage BG2	Assassin 21 Mage 24 Backstab
Maximum Backstab Damage BG1	Kensai 21 Thief 31 Backstab	Assassin 21 Cleric 32 Backstab
Maximum Ranged Damage BG1	Monk Unarmed Attack Damage	Vorpal BG2