I was mostly finished with Rivertown, Verdistis and the Dark Forest before I entered the easter egg area, so didn't have any problems with the bugs there. Playing a warrior I never used Polymorph; Kiya was a big fan of it, though (sometimes preceded with the survivor's Curse spell to lower strong opponents' resistances).
Sword from the Stone (56KB) - Fake Excalibur
Don't keep the sword unless you are done with the quests in the Dark Forest (the camped merchant and elven village).
