Tiscak was a Force-sensitive slave of the Tarasin species, according to Legends material.
Around 20 BBY, Tiscak, while still a young child, was taken prisoner along with three other Tarasin children, Li'Iri, Honna, and Kaj, because they possessed an inherent connection to the Force. Phylus Mon, a Chevin slaver, was the one who captured them. He imprisoned them within a cell located in his slave menagerie aboard the vessel called the Animiasma. Furthermore, he used his three-tailed barbed whip to inflict physical harm upon each of the children. Even the next day, the marks from the whip were still visible on Tiscak's face.
Their abductions did not go unnoticed. Jedi Master Lanius Qel-Bertuk was aware of the kidnappings and even had suspicions about Phylus Mon, but he was still unable to take any action to free them. The children were the only Force-sensitives held within the cell in the zoo. They felt an instinctive dislike for a fellow prisoner, Halin Bok. Honna also succeeded in establishing communication with the Mantellian Savrips in a neighboring cell, named Clu, Taf, and Mev. The Savrips pledged to break through the energy bars to rescue the children if anyone attempted to take them against their will. However, Honna was afraid of this, as the energy bars could easily kill the Savrips if they tried to do so.
Phylus Mon performed a surgical procedure to implant an explosive device close to the heart of each of his slaves. This explosive was designed to detonate upon Phylus Mon's death, but it could also be deactivated by the impact of an ion weapon. All the slaves held in Phylus Mon's zoo were also subjected to regular beatings.