The Geas Knights are referenced in an unnamed children's rhyme with the couplet:
The Geas Knight unknown by name, the seeker proud and true,
His endless quest hath rent the stars yet known is he by few
Geas knights dedicate their lives to a single task. It can be something general and innocuous, such as protecting the weak, or it can be something life consuming, such as a search for a fabled sword, or restoration of a king.
Traditionally, after a Geas Knight has finished their "quest", he or she commits ritualized suicide, known as 'Am-Ayr', becomes an ascetic hermit, or joins a monastery for the rest of their life. Many return to the skull-fortress of their order where they receive their quests in the first place to join the elder bone listeners there.
- In Celtic mythology, a geas is a form of magic. Those affected by a geas are compelled to fulfill certain conditions or risk death.