Hi there,
Just put the shroud into the inventory of a character, preferably the one with the signet (not equiped, but in the bag). Then, get out of inventory screen and
press the use/give button. Make sure you're on "give" and then cycle through until you're at the shroud. Then, give the shroud to the dragon.
If that doesn't work and all else fails, you can still access the Mavin by killing the Dragon. Then, all the doors will open just like if you give him the shroud.
Good luck on your adventures.
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