T'dai was a male Zabrak Jedi Master who served the Jedi Order and the Galactic Republic three hundred years after the passage of the Ruusan Reformations.
The duel.
A Force-sensitive, T'dai was trained in the ways of the Force by the Jedi Order, attaining the rank of Jedi Master. In 700 BBY, Master T'dai led a group of Knights to hunt down a group of Bpfasshi Dark Jedi. His former Padawan, Minch, an alien Jedi of an unidentified species, was one of the Knights under his command.
During the chase, one of the Dark Jedi defeated Minch, but T'dai and the rest of the Jedi intervened. The Bpfasshi apprentice killed himself rather than reveal his Master's whereabouts. T'dai then led the Jedi in pursuit of the Bpfasshi Master.
When the Bpfasshi master's ship landed on Dagobah, T'dai warned Minch not to pursue him. Minch disregarded his Master's orders, cornered the Dark Jedi Master in a cave, and defeated him, though the dark side would taint the cave from that point onward.
- The Complete Star Wars Encyclopedia