Kaer Almhult is a large fortress found between the islands of Ard Skellig and Spikeroog. After it fell into disrepair, a large group of bandit took over the ruins. One time the fortress was supposed to become the seat of King, but it never came into practice.
- Built centuries ago to serve as the home keep for the kings of Skellige. In practice, however, each ruler preferred to keep his clan's seat, and Kaer Almhult was left unused. Eventually the decision was made to turn it into a prison, and today the fortress is a crumbling ruin.
- There is a clear reference to Tyrion from A Song of Ice and Fire and the Eyrie's dungeons. If you go inside and kill the Pirate leader, he will have a key for a prison cell without bars, a sky cell. Inside Geralt finds a dwarf and comments "Sky cells... Nice idea for a prison without bars. Shame he didn't know how to fly".
- Within you can also find a pirate with a Mysterious Note that says: "Keep an eye out for castaways. Lone travelers. Drunk warriors. Bring them to me, to the cellar. The Ancient One craves blood. Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn.", a reference to the Cthulhu mythology of H.P. Lovecraft.
- Kaer or Kêr means "city" in Breton, while Ker means "city" or "fortress" in Cornish and Welsh.
- Kaer Almhult is likely named after Älmhult in Sweden