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This is the way I do it, but there are probably other/better strategies out there. 
Job: DRK/NIN
Weapons used: Great Axe, xbow and bolts (Acid, Bloody and Sleep bolts).
Meds: Not required but some potions can help you get out of a pinch.
Mobs to fight: Ahriman and a Dragon[1]
First part:
This part of the fight is the most important and dangerous, since you'll want to get rid of the Eye asap while keeping the dragon out of it. Start the fight by Sleeping the dragon, then use sleep bolts on it to keep it asleep (since they dont get interrupted and they rewrite sleep effect every time they hit).
I recomend using Great Axe for Sturmwind and Acid bolts on the Eye so you can get rid of it asap. 2hr when you are at around 50% hp so you get healed and can use Last Resort at the same time.
The only thing that can mess things up is if you get petrified by the Eye while using 2hr, but that rarely happens and you can retry as many times as you want anyway.
Second part:
Once the Eye is gone the rest is easy, get away from the Dragon (it walks around very slowly[2]) and use Bloody Bolts and drain to recover hp, then Acid to deal dmg. Keep Utsusemi up at all times so when you get drawn-in you can run away from the dragon without getting hit. The rest is just kite and shoot whenever you can.
You can walk up to the dragon whenever you get enough TP and Sturmwind it for added damage, Utsusemi is usually more than enough to go in, use WS and get out. Just remember to draw your weapon before running in, and unlock target to run away right after using WS.
Good luck.
[1] Names and some abilities change depending on where you fight them, but it has little effect on the strategy.
[2] But it has Draw-in. It uses it ocasionally, which will teleport you next to it specially if you get too far away from his melee range.
PS > I'm posting this because I rather save time and just link to this thread next time instead of reposting every time.
Job: DRK/NIN
Weapons used: Great Axe, xbow and bolts (Acid, Bloody and Sleep bolts).
Meds: Not required but some potions can help you get out of a pinch.
Mobs to fight: Ahriman and a Dragon[1]
First part:
This part of the fight is the most important and dangerous, since you'll want to get rid of the Eye asap while keeping the dragon out of it. Start the fight by Sleeping the dragon, then use sleep bolts on it to keep it asleep (since they dont get interrupted and they rewrite sleep effect every time they hit).
I recomend using Great Axe for Sturmwind and Acid bolts on the Eye so you can get rid of it asap. 2hr when you are at around 50% hp so you get healed and can use Last Resort at the same time.
The only thing that can mess things up is if you get petrified by the Eye while using 2hr, but that rarely happens and you can retry as many times as you want anyway.
Second part:
Once the Eye is gone the rest is easy, get away from the Dragon (it walks around very slowly[2]) and use Bloody Bolts and drain to recover hp, then Acid to deal dmg. Keep Utsusemi up at all times so when you get drawn-in you can run away from the dragon without getting hit. The rest is just kite and shoot whenever you can.
You can walk up to the dragon whenever you get enough TP and Sturmwind it for added damage, Utsusemi is usually more than enough to go in, use WS and get out. Just remember to draw your weapon before running in, and unlock target to run away right after using WS.
Good luck.
[1] Names and some abilities change depending on where you fight them, but it has little effect on the strategy.
[2] But it has Draw-in. It uses it ocasionally, which will teleport you next to it specially if you get too far away from his melee range.
PS > I'm posting this because I rather save time and just link to this thread next time instead of reposting every time.
