Rare variety of oversoul with a particularly evil disposition. This strain, as yet unrecorded in the Camp annals, is hunted in the Dalmasca Westersand.
Dustia appears in the Dalmasca Westersand the Corridor of Sand when at least one party member has less than 10% of their max HP remaining.
Dustia can be used to level grind. It can be spawned as soon as the player can leave Royal City of Rabanastre and Phoenix Downs can be bought from the merchant right outside Nalbina Fortress, past the Estersand. Being an undead, Dustia can be simply defeated by using a Phoenix Down on it.
The Book of Orgain loot is dropped commonly and it sells for a high amount of gil, allowing the player to buy more Phoenix Downs. There is risk involved, as Dustia casts Dark, which may kill the player's character if they do not defeat Dustia soon enough. This monster is good for speedy leveling because it is offers over a thousand EXP, 3 LP, valuable drops including the Flame Staff, and is Chainable via the Zone Out Glitch.
For leveling purposes, it is best to use this exploit at the beginning of the game because subsequent characters' levels are determined by and approximately one or two levels higher than Vaan's level.