[Corinthian]

In my experience of fighting C'tis; the best way to beat skellie spam is with overwhelming force. You want to be able to kill his skeletons faster than he can raise them. Or at least have enough killing power that you do not get overwhelmed. I have found that waves of cavalry is a great idea as cavalry have two attacks and get less fatigue per attack than norm tropes. Skeletons have too poor attack skill to hit cavalry unless they can swarm them. And the huge number of attacks from the cavalry will prevent that.

Cutting of their retreat rout with flying/teleporting guys, is also a good idea.