The blue-flamed Wraith will cast Ice spells, their Devil's Candle attack freezes the target, and can be eaten to learn Frost, whereas the red-flamed Wraith will use Fire spells, overheat their target with Devil's Flame, and can be eaten to learn Mustard Bomb. Being undead, curative spells hurt them, and Life outright kills them.
Location: Black Mage N°56 (Black Mage Village cemetery)
Both the red and blue variants of the Wraith from Final Fantasy IX appear as enemies in Final Fantasy Record Keeper.
Wraith is a Scottish dialectal word for "ghost," and/or "spirit".