Leperspawns

Defeat Jam or Zomgie, then report to the Ancient Ghost.

The time has come. Before the Demon has a chance to raise a new army, we need to enter the tomb and challenge him! Your path lies through the thicket, full of the undead. What is worse, there are only two ways to the tomb, and both of them are deadly dangerous.
One lies through the dead water. A huge ancient toad called Jam lives there. It was perilous even before the Leper, now is has turned into a real monster. You can judge by its name, it speaks for itself. Jam! It's jamming you and crushing your bones and flesh. Beware of its mighty croak, too. If you can, do not let it give a croak at all, if you can.
The other road leads through the burial grounds, where an ancient monster dwells. He once used to be a powerful necromancer, I think, Tep was is name... Oh, wait, I can see you're familiar with the name, aren't you? Now the monster by the name Zomgie is able to make all dead men rise from their graves. It will be extremely difficult to fight him, especially provided that there's a huge cemetery around. The pleasant surprise is that the corrupted carnivorous plants don't like the living dead too much, so Nature is going to be your ally in this war against Death.
Choose your path wisely! And take this trinket. Use it to summon me at any time! I will be with you all the time, and I'll try and warn you, if something goes wrong. Best of luck to you!

Battle with Jam will be long and exhausting, but if you are careful enough and don't forget to look upwards, you will surely avoid certain death. Zomgie dwells in the burial grounds, so you may go that way and find him. Watch carefully what he's looking at. His gaze is deadly.

It is quite obvious that the Ancient Mount is the very place, where the Leper is coming from, its heart, so to say.
On the bright side, we now know for sure that we have got to the heart of the matter!