The new patch buffed Exploding Palm in a big way. You hit a monster with it, it starts bleeding. Kill it while the bleed is active, it explodes for 50% of it's maximum health. Needless to say, that's a LOT of damage to be dealing out from a single skill. Use it on two or three monsters in the same pack, and you can often cause a chain reaction that takes out the rest of the pack.
Now, the last rune for Exploding Palm is Essence Burn. The rune text is:
Instead of bleeding, the enemy will burn for X% weapon damage as Fire over Y seconds. If the enemy dies while burning, it explodes causing all nearby enemies to burn for Z% weapon damage as Fire over N seconds. This effect can happen multiple times.
Based on usage, I get the exploding effect on other multiple enemies, but I can't seem to figure out if they take the extra 50% explosion damage on top of the burning effect. If they do, Essence Burn is seriously silly in how you can just apply it to one, and watch the explosions happen.