15 Toughest Bosses in The Entire Witcher Series

Iris’ Greatest Fear – The Witcher 3: Hearts of Stone

Bring some Spectre Oil and Blizzard potions along with a fully levelled Quen because you’re going to need it. Iris’ Greatest Fear involves fighting Ethereal versions of Olgierd and they get stronger as you defeat them. The real challenge comes from not attacking more than one Ethereal at a time, which is tough given the number of stages to this fight. Doing so essentially seals your fate. If you beat it, then congratulations – you’ve overcome the toughest fight that the series has to offer.