Mid Game+ magic.

[sushiboat]

spirokeat said:
Ok, so I summoned a Ice Devil finally. Equiped him with wraith blade, bone armour, winged shoes, ring of regen and amulet of luck.

First battle he enters against an army of infantry and a mage. Paralyzed. instantly dies.

MR of 19. Im hoping that it was a big fluke.

It can happen to any SC, even with the best equipment. You can give it lower risk assignments (e.g., capturing provinces with low PD, having it fight alongside an army), or you can just create more SC's. In my opinion, the SC's mobility is more important than one-man-army heroics.

Did you have him buff with Quickness and Breath of Winter? BoW will help even when the SC is unconscious. Bone Armor is low protection, and the Wraith Sword already gives you life drain. Try something with higher protection, such as Marble Armor. A Starshine Skullcap would be good since you can never have too much MR. With lots of Blood, you could give him a Blood Thorn, which would free up one hand for a shield -- Charcoal Shield is my favorite.