Kaer Gelen is a ruined fortress found in the northern mountains of Ard Skellig, in Clan an Craite territory. It his home to various night prowlers, such as katakans and wraiths.
- This old fort's ruins attract the sort whom one would not want to run into in a dark alley.
- Kaer or Kêr means "city" in Breton, while Ker means "city" or "fortress" in Cornish. Caer means the same in Welsh.
- Gelen means leech in Welsh.
- When pulling the lever to open the main entrance, the portcullis is seen slowly clipping through the stone arch above instead of sliding into a proper slit, a minor mistake on CD Projekt Red's part.