Divinity: Original Sin 2 – Skill Book Combinations
If you combine a skill book with another skill book then you get a brand new skill that requires both classes. This only appears to work with an elemental and non-elemental skill book. This is a quick list of the skills you can acquire this way.
Combinations
Fire + Necromancy = Corpse Explosion
- Explode a corpse, deal damage
Fire + Polymorph = Bleed Fire
- Enemies create fire surfaces when hit
Fire + Warfare = Sparking Swings
- Melee attacks leap to the second target
Fire + Hunter = Explosive Trap
- Set up a trap, explodes when approached
Fire + Scoundrel = Sabotage
- Grenade or arrow in target’s inventory explodes
Fire + Summoning = Fire Infusion
- Minion switches to fire and learns fireball
Air + Necromancy = Vacuum Touch
- Damage, suffocation, and silence
Air + Polymorph = Vaporise
- Turns surfaces into clouds and cures petrification and frozen
Air + Warfare = Breathing Bubble
- Immunity to clouds and suffocate
Air + Hunter = Erratic Wisp
- Target teleports randomly when hit
Air + Scoundrel = Smoke Cover
- Create a cloud centered on self
Air + Summoning = Electric Infusion
- Minion switches to electric and learns electric discharge
Water + Necromancy = Blood Rain
- Douses fires, makes enemies bleed, blood everywhere
Water + Polymorph = Healing Tears
- Generate tears that heal allies who move nearby
Water + Warfare = Cleanse Wounds
- Heal, remove burn, disabled, decay, poison, and bleed
Water + Hunter = Cyrotherapy
- Convert nearby frozen ground into magic armor
Water + Scoundrel = Vampiric Hunger
- 50% life steal for two turns
Water + Summoning = Water Infusion
- Minion switches to water and gains restoration
Earth + Necromancy = Corrosive Spray
- Cone of damage, acid, and atrophy
Earth + Polymorph = Turn to Oil
- Converts water/blood to oil and removes stuck and shock
Earth + Warfare = Oily Carapace
- Consume nearby oil to gain physical armor
Earth + Hunter = Throw Dust
- Damage, Blind, Removes surfaces and clouds
Earth + Scoundrel = Venom Coating
- Adds poison damage to weapon attacks, 2 turns
Earth + Summoning = Poison Infusion
- Minion switches to poison and gains poison dart
All skillbooks will be of the elemental element except for Blood Rain (which is necromancy) and all infusions (which are summoning).
All skillbooks require level 1 in each of the two skills needed to make them, except Corrosive Spray which requires level 2 in each.
Information provided on what the skills do is a summary of the tooltip, rather than actual ability use. In many cases the tooltip is a little vague.
Most amusing combination award goes to erratic wisp which you should use on your allies constantly.