[Nagot Gick Fel]

C'tis has several good counters to slow heavies like Ulm and Abysia.

Death Cloud does armor negating damage on a wide area and the Sauromancers are good at it. The Shamen can gather for a communion and use spells that disregard armor like Poison Cloud or Stellar Cascades (among others). Ulm with its low MR troops and lack of morale support is particularly vulnerable to spells like Terror.

And don't forget rituals (Leprosy, etc.)

For summons, try Ghosts. They eat HI like donuts.