How to play well C'tis ?

[Saxon]

Aroglith has a powerful strategy which uses Disintegrate. I forget the details, but if you run a search, you will find some more on it.

I love Miasma against long life troops, like Ulm or Johnteim. Lift up your dominion and make your neighbors suffer. Boost a sorcerer with the thistle mace and get Gift of Health to avoid diseasing your own troops, notably sages if you get a good sage province.

The undead are the way to go. For undead archers, there is a good spell that summons a troop of undead with flaming arrows. If memory serves (I am in the office) it is a death and nature magic spell, so it is a good secondary use for the mage who casts Gift of Health. Similarly, mass protection is very useful generally, but I found it particularly useful for C’tis.

For your god, consider the undead sauromancer. Besides just being fun to have an undead lizard god, an immortal with high death magic can summon a lot of troops to trash independents or AI. If you are using Miasma and working to push your dominion, it also means the immortal can be used more offensively.