Best way to play C'tis Miasma?

[shovah]

i got 8 emposoners with skull staffs and talismans casting the spell that gives like 5 skeletons, the talisman is mainly to help vrs archers/flyers. my empoisoners did a huge amount of damage. also, can u assasinate while u r besieged? that would b fun with miamasa and high def fort. also i cant find any advantage to take the dark fort over mountain fort. same price but dark is faster to build and stuff