Please help , I need to cancel a quest . Vickas and I went to kill a dragon , but it is already dead .
Now he's stuck to me every where I go . Have completed main plot , and was enjoying the game free play. Now I can't do anything without Vickas.
Don't want to start again!!!!

If you can't kill him or dismiss him or recruit another follower to get rid of him then try reloading an earlier save.

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...and you can try to do this: You may need to spend 30 days away from the dragon lair location for a dragon to respawn.