Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - General Optimal party discussion.

I don't think there is a "best" party composition per say, aside from abusing mechanics, all Combat Abilities are good and useful besides Necro as far as the Early Access Alpha version goes.

For me, I find that the best party is the one that makes the best use of the basic utilities certain Combat Abilities offer. Which is why I use Scoundrel for everything. Adrenaline is simply the best skill in the game.

If I had to redo a party for another game, I'd go with the following:
1. Lizard Pyro/Geo using Bow or Crossbow with 1 Scoundrel and 1 Huntsman for Adrenaline, Cloak and Dagger, First Aid, Tactical Retreat and Special Arrows.
2. Human War/Hydro using Sword and Board with 1 Aero and 1 Scoundrel for Adrenaline, Teleport, Nether Swap, Shocking Touch and Lightning Discharge.
3. Lizard Aero/Necro using Dual Wand (Poison main hand + Fire off hand if possible) with 1 Scoundrel and 1 Pyro for Adrenaline, Fireball, Haste and Burn your Eyes.
4. Elf War/Two-handed using Two-hander with 1 Scoundrel for Adrenaline and Cloak and Dagger. Make sure you have Warlord talent for that character.

#1 is there mostly for support using Special Arrows, Fortify, Haste, Burn my Eyes and applying slow with oil, but also provide with Geo/Pyro nukes against high physical armor enemies to quickly remove magical armor for #2 and #3 to stun with Aero.
#2 is the tank and healer. His only purpose is to soak damage and support with as many CCs as possible. Being in the thick of the fight, he can make use of any CC and have the best positioning for using teleport on enemies. Human for Encourage and Bartering.
#3 take care of whatever is left. Provides support damage to both #1 and #4 with Mosquito Swarm, Dual Wand attacks and Fireball. Also bring a second copy of Haste and Burn your Eyes to the table.
#4 is all about dealing physical damage and wiping out the enemy ranged characters with the help of #2 and #3 teleporting enemies in and swapping melee enemies with their ranged allies. Rage + Adrenaline + Flesh Sacrifice will easily allow him to execute at least one monster while hitting multiple enemies with Crippling Blow, Whirlwind, Battle Stomp, Blitz Attack and Battering Ram. Once one of them goes down, the Warlord talent kicks in and it's easy to chain up the kills from there. Can also use Phoenix Dive or Cloak and Dagger to not die from Rage debuff if there are still a lot of enemies alive.