Haven tactics.

For example, like this (level 21):

Against Necropolis:
3 Logistics - Pathfinding
3 Defense - Mass Stone Skin - Reflection
3 Attack - Mass Haste - Ballistics
3 Luck - Magic Resistance - Soldier's Luck

I wonder, why Reflection against Necropolis? There's only Ravenna with Chaos. And where is Leadership? You can take -11 from the Shout. There's no tactic either.

P.S. Against a Dwarf at level 21, Haven has no chance either.