Return the Skull
We trek back up the mountains and find the dragon graveyard, hidden in some caverns. Working our way through what is a museum-like set of caves, with dragon skeletons seemingly on display, we look for the skeleton missing its head.
Naturally, we are not alone. Guardians appear in some of the rooms, guardians who are apparently not happy to see adventurers trying to do some good.
'In the gloom you see a large lion, except for its golden mane.'
'I thought all lions had golden manes.'
'If you'll let me finish. ...except for its golden mane, the lion is covered in silver scales.'
'So it's a dragon! A lion-dragon.'
'Maybe a... drag-on? No, that doesn't work. A li-on? Naming creatures is difficult.'