As a Writhing One you can take control of the worm that walks, bump into the shady cornac and take the arena quest. Afterwards the cornac disappears, the quest is active, but you're not transported anywhere.
I found the same bug in the archives submitted 3 years ago regarding alchemist golem, don't know if that was fixed. But it happens with wtw in the current version.
[1.7.4]Taking arena quest as a pet wtw fails
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