Imp-atient  

Plane of Fire (Doomfire, the Burning Lands) actually works very well if you are high enough to just zerg the place. The entry area/field has a number of jopal spawns and there seems to be more near the lava river. Clear those and move across the lava river along the base of the wall where there is a dozen jopal roamers or so. Follow the river to the north area with small islands in the lava. There are a ton of them here and after clearing the islands swim the lava tunnel in one of the islands up to the castle area. With high resists I was taking 10 dmg per tick in the lava - no worries. The other end of the tunnel has another 10 or so before you get to the door. At this point I had 61 kills.

You can go back and start over in the entry area, or invis/head back to the second field past the first castle area. The only warning is on the way back to the second field. If the 2 phoenix are up they can be taken down, but both will try to mez you. While grinding xp in C1 at lower levels I have seen high level characters get mezzed and the phoenix then sent them into the castle after those of us killing in there. A monk basically one shot all of us while mezzed. In the second field there are a number of jopal roamers here and tons of adds. Several named were up roaming around too including a huge yellow frog, a super huge demon (like old school dragon big) and huge spider. They died like the rest of them. This was a fun zone to run and went by very fast. Total time was probably 30 minutes.

Lavastorm Mountains , they are easier to kill and respawn faster