It is currently bugged, and way harder than intended. I would wait for a fix, before trying it again.
1st boss bugged, YES, hard not at all. Finish it solo 5 times, 1 vang dps, 1 mando dps, 1 BH tank, 1 merc dps and 1 as sage dps. Rest as vet group.
hard are the Umbara, Meridian, Nathema, Blood Hunt.