Mana Worm

WARNING: When facing these creatures, it is vital to kill/disable them before they can hit you. With the exclusion of Evolution, who can restore herself by transforming, this creature's default attack will PERMANENTLY lower the target's mana, with no way of regaining the lost stats.

The SuckMana makes them dangerous as an enemy, but as an ally it's quite average. They can sacrifice max mana to increase Magic, but it's only used for their Regenerate and nothing else. However, unlike Glow Worms, they only have two set skills. You can take advantage that and their 2.0 mana growth by getting them some other skills to turn them into mages. Otherwise, these will serve as your tanks with their StrongManaDrain and Regenerating abilities.

Note the ManaWorms dropped/produced are materials and need to be crafted into the consumable version.