Vana'diel Bestiary: Lobais  

You gotta be careful with this taru, because it also has Grim halo~ on my attempt it did Grim Halo (400 Dmg or 3 Shadows gone) + Astral Flow (Fernir 2hr) which instantly wiped the entire alliance....

Best to have a bard for Dark Carol and to sleep the Element>> also I suggest 2 Tanks actually tank it while 2 nins stand far away from the party so after it blows its 2hr it doesnt despawn.

If your a taru like me, your unlucky enough to have the hardest NM to fight lol. I'd reccomend 2 ninja's in your party, because when it does its 2HR, its instant, there's no running away. First there's its element pet, then it summons a avatar and uses its 2HR in like 1 second as if it was a job ability, not a spell you can run from while its summoning. Anyways, everyone got wiped with full life except the nin we had hiding from the fight, to claim it after everyone was dead, so it wouldnt despawn. Alright well, make sure you all have reraise on. We had 2 nins passing hate even while weakened. Because its a joke fight after he used his 2HR, after that its real easy, no more avatars, he just hits you with his staff, and summons element pets.
Ok well i hope i said enough information here, because ive seen plenty of parties go in there expecting it to cast to summon his avatar, and just everyone get wiped and the NM despawns so there codex & fomor hate was wasted. Goodluck to everyone who's unfortunately stuck with this NM!