The only boss that you'll probably need to be concerned with is Riyadh, who will silence you and strip your buffs. He also summons five treants and seems invulnerable as long as those are up.
There is an agnostic version of this dungeon available to players level 10 through 95.
Mark of Manaar Quest NPC: Alia at ( -2, 0, 14 ) Copy/waypoint -2, 0, 14
The extra Mark of Manaar chest is located under water at the front of the zone.
The extra Mark of Manaar chest key mob is an aqueous devourer 90^^^ heroic located in the Well of Gold under water at ( -35, 96, 69 ) Copy/waypoint -35.20, 95.85, 69.05