Decide for yourselves where to fit them in:
Stormblades - former swordsmen of Erathia, who switched sides to the Ice Elves.
Whirlwind Strike (Can be used instead of an attack when the unit is surrounded. Stormblades summon a whirlwind in which they spin, dealing damage to all surrounding enemies and stunning them).
Ice Mages - have mastered the arts of Cold and Ice. On the battlefield, they fight well both at range using Ice magic and in melee. It should be noted that they cannot shoot! Only cast spells!
Ice Spear (The mages materialize, skipping one turn, an ice spear, which they can use both in melee (deal cold damage, freeze, reducing initiative) and at range (they can throw the spear, which works like a regular attack from Academy mages, piercing all targets in a straight line, but upon hitting the last target, the spear breaks, inflicting "Freezing Cold" on that target. The spear must be summoned anew each time for mana!).) Spellcaster (some kind of ice spells).