help with quest wynnexcavation site D, shadow amadel

can anyone help me, I've been struggling on shadow amadel. like its impossible to kill him. I almost can't see him, I get pushed an pulled by his minions, I CANT even kill his minions/clones. he keeps jumping in the air making it even harder to spot him because he lands in the middle of his minions, and he keeps regenerating to max health like every 20 seconds. its not the fact that he keeps killing me, its the fact that I run out of health potions after like 20 minutes of fighting, and every time I die I have to do the quest all over again. anyways im archer with a boltslinger archetype. im level 70 and use maelstrom.