Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - General Pyromancer and Geomancer skill tree bonuses

Spell AoE is a huge no no! AoE is Surgical. You cannot increase it with an immediate idea that it is better.

Maybe Fire lowers Friendly fire damage and gives your CCs a chance (or outright negates) to miss friendlies... including that created by hazards.