The trih xeem was a powerful weapon that was used to force a star to undergo an early supernova. Originally created by the Jjaro, after their disappearance the Pfhor had captured a number of these weapons.
The trih xeem was used on at least three occasions;
- once against the Nakh – a "client" race of the Jjaro – and their rebellion six thousand years before the events of Marathon 2: Durandal;
- once against the Drinniol, in an undated slave rebellion;
- and once on Lh'owon's sun in Marathon 2: Durandal.