Try clicking on the x to exit the conversation with the imp rancher. That can help a similar problem with the imp hero.
Did you try clicking on the wine chest? You character will walk through an illusion wall. Similarly, if you move the 2 barrels against the wall around the key to the east...
Some areas of the game were removed before release, so a few monsters got stranded outside the play area.
Explore the mushroom forest south west of the imp village. You should find a few imps in need of that antidote.
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