So I noticed earlier today that if I summon an Eye of Kilrogg, target something (that is attackable), then dismiss the Eye of Kilrogg it instantly got aggro on me, line of sight and such being no matter. Reason I add "that is attackable" is that it doesn't work on things you have to trigger before being able to attack or your own city's guards.
After some testing it seems the only two limits to this pulling method are:
1. You have to be close enough to be able to still have the enemy targetted when you dismiss eye of kilrogg.
2. The mob can reset before it reaches you.
Summing method up:
Summon Eye of Kilrogg
Target enemy
Dismiss Eye of Kilrogg
Forgot to take a screenshot in CoS when we used it to pull timed boss, but a guildie of mine did so:
As you can see we're only on wave 3 on the trash and the timer still has 23 min, in addition to our position it should be fine as proof.
Due to Eye of Kilrogg this is warlock only, but in theory Eye of Arachnida from strat should work as well