There's a reason J and I both go into your campaigns making sure we have a handful of multi-target or area atacks (Armour of Agathys in Saeryth's case - it's enough when 1 fight/day is common). For what it's worth, the reason I went for Charisma-based Infernal Pact rather than Dark Pact is that Cursebite (Close Burst 20, affects cursed enemies) just felt cheesy with the way you handle monsters although I'd happily use it in other campaigns. The Promises to the Daughter feat I'm using on the other hand can be handled with firebreaks betwen the minions. Of course that makes it harder for you to dogpile the fighters at the centre, but they go down anyway.