No he's really not hard, he can just cause you to time out when he puts his annoying shield up after using Bishop's Gambit, and depending on the weaknesses you're being given, it can be time consuming to break the shields. Last night we capped lights and killed it in 10 minutes, we had weaknesses we could save for when he put his shield up and proc them to remove it, then on the next Pil we timed out at around 30% because he was putting his shield up over and over again and we had weaknesses we couldn't proc, so luck plays a part in it.
We found Akvan to be very easy, it's basically just a normal Ahriman with the addition of Deathly Gaze (which you can turn away from to avoid) and the Death spell. Both of these can be stunned assuming it doesn't have Magic Barrier up, I'd bring a backup tank though just to be safe.
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