Panacea (potion)

div potion to get to the ticket for this item, go to the lower part of greed's gallows, and wander around to roughly the middle of the south side of it, until you find a door to the south

I don't think it has a key, but pass door will let you through. The room is no-quit, so you can't be greedy.

pick up the white journal off the floor, and teleport to zikthro and give him the ticket now you have a div potion