Moving on from the execution site, you stumble on a strange scene. Two large owlbears are rolling around in a depression filled with glowing mushrooms. The owlbears pause, stare at the characters, roar, and run to the characters.
The two owlbears are high on the mushrooms. They are frenzied, hallucinating, and like most things here, hungry. They have a morale of 12, +1 to hit and damage but a -1 penalty to AC.
They have no treasure, but the story of fighting two Owlbears tripping balls is worth more than any treasure.
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This encounter was inspired by this art by Jacob Blackmon.
You can get it on a shirt here.