I found this in the "La cage au fou" mission from the Blood and Wine expansion. I'm pretty sure Gunter O'Dimm (from the Hearths of Stone DLC) cursed the spotted wight :
A letter found in the quest "La Cage Au Fou". Possible hint at Gaunter O'Dimm? : r/witcher
La Cage au Fou - The Witcher 3: Blood and Wine Game Guide | gamepressure.com
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Video: La Cage au Fou Part 5 – The Witcher 3 Guide
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La Cage au Fou - The Witcher 3: Blood and Wine Game Guide | gamepressure.com
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:no_upscale()/cdn.vox-cdn.com/uploads/chorus_image/image/49730413/LaCageAuFou2.0.0.jpg "The Witcher 3: Blood and Wine walkthrough: La Cage Au Fou - Polygon")
The Witcher 3: Blood and Wine walkthrough: La Cage Au Fou - Polygon
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La Cage au Fou Walkthrough, and How to Lift the Curse | The Witcher 3｜Game8
GameBanshee
:no_upscale()/cdn.vox-cdn.com/uploads/chorus_asset/file/6565591/LaCageAuFou.0.jpg "The Witcher 3: Blood and Wine walkthrough: La Cage Au Fou - Polygon")
The Witcher 3: Blood and Wine walkthrough: La Cage Au Fou - Polygon
La Cage au Fou - Walkthrough - Blood and Wine DLC | The Witcher 3: Wild Hunt | Gamer Guides®
Video: La Cage au Fou Part 3 – The Witcher 3 Guide
La Cage au Fou - The Witcher 3 Wiki Guide - IGN
