How to play well C'tis ?

[Yossar]

C'tis has the best death magic in the game besides Ermor, so use it. The spell "Raise Skeletons" is your friend early on. 2 or 3 sauromancers with some bodyguards in the front to soak up arrows can take nearly any province with almost no losses by just casting that. Bane Lords with boots of flying, jade armor, and wraith swords are great raiders.

Your best infantry are elite warriros and falchoniers. Swamp guards aren't bad just to tank. Poison Slingers are decent in certain situations. The assassins are pretty good if you give them some nature gems to cast swarm. They're in trouble if they get into melee, though.