All u need to do is going to nagrand at this point:
Exclavize mo'arg master planer
(500dps ,50k stamina) ,
,
now u have it go to others elites that are around it and kill thems they dies extremely fast and gives u about 2500 xp.
I recommend to stay out of water if exclavize demons fails if ur minion is killed another good elite are the elite felguards.
You also can farm Mark of kil'jaeden with normal mobs here, they are in groups of four , they dies with about 4 hits from ur elite .You can use this for kill quests elites.