Spectre

Combat
A Spectre is essentially the same unit it was before dying with a few changes. The change to movement, their current level becoming their Max Level, and their max Morale is cut in half. The stats provided in the gallery can be disregarded unless you summon then while playing Creation, since there are no gallery-standard Spectres that spawn in-game. Default Spectres have the potential to make good mages as they have one of the highest growths for Magic and Mana, but you'll have to manually get them every spell.

Moneymaking
More often than not you'll want a Spectre for crafting, since no other unit produces Ectoplasm.