http://www.eqatlas.com/ykesha/dulakmap.html
Zone in from Gunthak, big building on left go inside, take the ladder upstairs.
THe mobs you want, are all inside the mines. I just took my 75 necro and invised to them, tagged them, and ran them back to the IZ, and killed them...and the associated train, and logged beastlord in and let him loot.
No one ever goes there. It's pretty safe to do it. And anyone that did go there, wouldn't loot that from your mobs.
Otherwise, you're gonna have to kill a whole lot of mobs you don't need, to get to those enforcers. Even invis, when you tag 'em, there's mobs around them that aggro ..and at the level you need this spell, I think it's close to suicide, solo. Incidently, (and don't get me wrong.) I have this and have been using it in POI, and from 50 - 57 it's pretty worthless. It either gets resisted, or it does so little damage, it doesn't matter. I've been nuking them with the other poison dots.... Those stick much better. At least from 50 - 57.