Fists of Fury: Champion of Champions - Skellige
Quest Giver: Complete all 3 Fists of Fury Quests
Other Requirements: N/A
You'll begin this quest immediately after completing all three of the previous Fists of Fury quests. Fists of Fury: Velen, Fists of Fury: Novigrad and Fists of Fury: Skellige. Upon completing the final one of these three quests you'll be approached by a man who gives you this quest.
For this quest you'll have to fist fight a Rock Troll. However, it's much easier than many of the other fist fighting quests as you'll be able to use Food and Potions during this fight. This Rock Troll fights like all of the other Rock Trolls in the game - most importantly when he yells and pounds his chest get distance between the two of you. He's about to charge and swing wildly.