When you first zone in to this instance you'll see a Cursed Toad hopping around (friendly). Mobs will attack it. I assume if it dies you fail at what I am about to decribe. Clear all the mobs between the Cursed Toad and Felena, then talk to the toad. It will start following you. Talk to Felena with the toad in tow and a High Priest will spawn. Kill him to break the curse and turn the toad human again. Talk to the NPCs and they will give you the loot you seek :)