Elven shamans can be found on floor 5a in the Slayerdungeon of Prifddinas, which is one of the rooms the player may enter after passing floor 4. Elven shamans drop a variety of Summoning ingredients which makes them worth killing. If a player tries to attack the shamans with a familiar present, they'll take control of the player's familiar and have the familiar attack the player. The player cannot dismiss the familiar until the shaman is dead, after which the familiar is free of the shaman's control.
It's widely known that the shamans were once a group of strong warriors from the Amlodd Clan, but after realizing that no others from their own clan could rival their strength, they took advantage of this and gained powerful positions in their clan by force. Eventually, Lord Amlodd was challenged for his position as leader of the Amlodd Clan, and so seeked help from the Iorwerth and Cadarn clans. Working together the two clans managed to drive the elven shamans into the slayerdungeon of Prifddinas and used seals to imprison them within their room.