Wyvern

A tiny dragon-­like creature with a whipping, stinging tail that is extremely territorial. Flies and attacks in small bands, usually with no more than three to six Wyverns per group. Skeletal Fell Beasts are shaped from the bones of dead Wyverns.

At 44 points the Wyvern is the cheapest unique Mage Spawn, so get it into the Dungeon as fast as possible. Once it’s in the game, use its Flight to maneuver into close combat where it can deliver its toxic Venom attack. It can’t stand up to a prolonged battle, so keep it active and move it often. Don’t worry about leaving it in the open - ­­its Battle Armor will keep it safe from a ranged attack.