Ahrimans in Final Fantasy Tactics Advance are crimson variations of the Floateye enemies. Their high Move stat (5) and ability to fly over other units and high terrain make it one of the most mobile enemies in the game. The Ahriman is most notable for its deadly Roulette spell. Fortunately, Ahrimans have one of the lowest HP scores for any monster in the game, and their Defense score is rather low. That is why the Ahriman has the ability to lower the attack power of enemy units with the Circle ability. This skill more than doubles the time that the Ahriman gets to stay on the field before it is KOed.
Thankfully, the Ahriman here does not know the Roulette skill.
Mission #005: Twisted Flow
Famfrit summons two Ahrimans to help him in this mission. It is a good idea to move a unit into the range of the Ahriman on the right's attacking range. This way, it will be lured to your party instead of using the Roulette skill.
Mission #100: Fiend Run
The Ahriman in this mission has escaped from the Monster Bank.