This is a Town NPC. A House may be required in order for it to appear.

The White Mage is a Town NPC that does not have any requirements (except for a house) to appear.
White Mage information

Items sold:Edit

At start: Lamp Tome, Pure Tome,

After first boss:Cure 1 Tome,  Heal 1 Tome,

Hardmode world: Cure 2 Tome, Barrier Tome, Heal 2 Tome, Dezone Tome.

Golem Defeated: Cure 3 Tome, Wall Tome, Heal 3 Tome