The Most Truest of Basilisks
Back to Novigrad
Across the bridge on the eastern side of Oxenfurt you’ll come across a beast in a cage. A Beast Tamer is trying to convince a group of soldiers that it’s a Basilisk whereas Geralt knows it’s a Wyvern.
Point out to the men that the beast is in fact a Wyvern and the soldiers will realize that the Beast Tamer is a cheat. Just at that moment the cage will break open the Wyvern will escape. Kill the Wyvern to complete the quest.