After entering the cave and you see the broken ground and lava about 50 yards ahead of you. Just swim through the lava along the right wall till you see the bridge, then climb the right wall. You'll see a fire pit and several blackhands around the fire as well as the landing you just climbed up on.
Pathing is a little odd, but you can easily fear kite these guys.
You don't need to swim through lava. There are 3 entrances to Nadox (not counting the zone with Hate's Fury), and only one goes through lava. The main entrance is through the temple in Gunthak and is perfectly safe if you are invis.
With my fire resist about 180 i only take 10 pts a hit in the lava, i have been able to commonly get passed the lava with only 3 lava hits, have done it with only 1 hit, but average 3 hits. With aa regen 3, mage regen armor 5 pts, i hardly notice the lava. been pulling the elementals to the zone then going in and grabbing the trolls near the bridge and pulling them to the zone. Takes some practice but with good swim skill, high fire resist, innate run 3, you can go back and forth with very little damage.
no spells with lev as a portion of the spells effect will work in this zone. so no air elemental illusion, no dmf, no soe , or any other spells with lev included.