If they will allow Sorcerers to triple Fireball their way through every encounter with Haste and Quicken, calling hard difficulty "Tactician" is a bit of a joke isn't it.
Triple Fireball is for noobs in this Larian game. You get more damage by casting Create Water followed by two Glyphs of Warding with Lightning Damage. :P
Then throw in a 2 class dip into Tempest Domain Cleric and you can max roll the damage on them...