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Triolium-L was a substance essential to Starfleet starship warp drive in the 23rd century.
It served to preserve dilithium crystals, prolonging their operational life inside warp engines.
Quodar contained rich deposits of dilithium and triolium-L. In 2266, Quodar was admitted to the Federation for its strategic location regarding the Klingon Empire and for its supply of triolium-L. (TOS comic: "The Final Truth")