[thejeff]

Stellar Cascades is a great spell against SC and thugs and it's pretty good against relatively small numbers of elites or heavies, but it's useless against waves of chaff. Especially when you're fighting them with elite/heavy troops. They get rack up a bit of fatigue, but since it's spread out it never really builds up. Then your elites kill the front rank, which they would have anyway, and fresh chaff steps up.

With Bogarus, you've got lots of mages with low paths and Astral. I'd say your best bet is reverse communions and spew your favorite elemental damage. Falling Fires/Thunderstrikes/Magma Eruption/Astral Fires.

If it's any consolation, that Shedu is probably toast, assuming he survived the battle. I don't think the Horror Mark is resistable.