A planetary system whose two inhabited moons were locked in a dangerous dispute that the Trill mediator Odan was sent to resolve.
Peliar Zel is a system whose two inhabited moons, Alpha and Beta, have quarreled over the effects of an energy project that one moon draws from the planet's magnetic field. The dispute has brought the two societies close to war.
In The Host, the Enterprise carries the mediator Odan to Peliar Zel. After Odan's host body is fatally injured, the Trill symbiont is placed temporarily inside Riker so that the negotiations can continue, and the talks succeed before a new Trill host arrives.