How do you fight the Niefel giants?

[Lyzra]

I play usually C'tis of various ages and I admit these giants can be slightly stressful to face on early game.

My advice is very limited, it ties to the side that they do rely on cold. If not directly they cannot make sizeable lasting armies if you can spread hot dominion outwards. The supply of giants will be so penalized they succumb to diseases and starving.

Thus, my strategy is often based on just decent point defence supported with additional forces and simply wear them down, by spreading hot dominion against them. Considering they do not have great defense values or immensly good shields, missile troops probably would be good to use against them aswell. With C'tis that is not something to even bother.