The video above is the The Witcher 3 Wild Hunt The Isle of Mists Main Quest Walkthrough and shows how to complete The Isle of Mists, the quest featured in The Witcher III: Wild Hunt.
The video walkthrough covers the following objectives:
Follow the firefly.
Check what’s in the hut.
(Optional) Find Ivo.
(Optional) Find Ferenc.
Find Gaspard.
Bring Gaspard to the hut.
Wake up Gaspard.
