Lich

Many powerful mages saw the beginning of the influence, and figured they'd cut out the middle man and sustain themselves. Indeed, although they require chakra as much as any other undead, they simply use their mana to fulfill the role, although they can drain chakra from any interlopers in their schemes.

Liches tend to sustain themselves through a magical artifact they created, which supplies or houses the mana they need. As such, even if their body is destroyed by some plucky young adventurers, they can regenerate in a new body within a short number of days. However, the cost for this is very high in knowledge and power, so liches are thankfully extraordinarily rare.

However, liches tend to live long lives interrupted or not, and as such have access to spells and abilities even high level mages can barely imagine. The fact that they tend to fight alone is little comfort when confronted with their dazzling abilities. Which I can't think of defining yet!

Combat

Encounter Party: 1 Lich