Benefits heavily from Mana increasing Traits. Even if you give it Telekinetic so the awful Mana pool isn't a problem anymore, it's still recommended to increase their Mana capacity so that you can use their other skills for survivability. Alternatively, you could get them Life Bound so you can cast from Health instead. Their fixed skill SlimeHeal will heal more than it costs, as well as shield your Light Tanid, making it viable in terms of both sustainability and survivability.
By default their only attack spell is LightningBolt. While it has long range and low costs, it can only hit one target that's along a direct line from the caster, making it restrictive to use. While it's easy enough to get them other spells with Creation, their natural skillset makes them more supporters than mages. Having said that, half their skills will factor in Magic, so you might not want to go out of your way to make a Support Level Type.
- Channeling mana through many openings at once decreases efficiency.