The closest fast travel point isNovigrad Gate,on the bridge itself.
The quest is just a short distance away.
You will encounter a small gathering of Redanian soldiers around a traveling merchant and a monster in a cage.
Walk up to the merchant and talk to him to start a cutscene.
Geralt willcomment on the monsterbeing a wyvern, instead of a basilisk.
The soldiers see this mix-up as fraud and demand a refund from the merchant.
The resulting commotionstartles the wyvernenough to destroy the cage, allowing it to escape.
Putting The Wyvern Down
Rampaging monsters tend to be incompatible with human life.
The soldiers will join in the fight, making this encounter much easier than a one-on-one fight would be.
The quest will automatically end once the wyvern is slain.
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