Crystal Girl

Evolution
It can be evolved from Ice Spirits or Rock Spirits, learning Encase and CrystalShard in the process. In the case of Rock Spirits it also grows one size.

You can choose one of the following:

Combat
A powerful mage able to nuke, tank and even support, it boasts great Health/Mana/Magic for low Strength/Lust/Speed.

Moneymaking
It takes them 5 stamina to produce 1 crystal. Portal event rates are 200 gold for 5 crystals. Market rates are 200 gold for 1 crystal. A crystal girl with 100 stamina gives you a total of 20 crystals.

However their real value comes from by-product use.

When you use them for fusion, you can exhaust their stamina creating crystals before fusing with no downside to the resulting unit.

You can also breed them for give-away tasks, such as lust genes 5+ characters for Brothel, and use their stamina to make crystals before handing them over.

Trivia

 * Lives in crystal biomes.