Beelzlit Grathan, a male Human and Sith Acolyte of the Sith Empire, known in Legends continuity, was the offspring of Cellvanta Grathan and a Lord named Grathan.
Beelzlit's upbringing occurred on Dromund Kaas, where Cellvanta, his mother, provided him with training in the ways of the Force.
In the year 3643 BBY, Lord Grathan initiated a revolt against the Sith Empire. Darth Baras, utilizing his apprentice Dri'kill Ba'al, identified a vulnerability in Grathan: his concealed son, Beelzlit Grathan. Consequently, Darth Baras' new apprentice was dispatched by the Sith apprentice with orders to assassinate Beelzlit. When Baras' apprentice arrived to eliminate them, Beelzlit and his mother were inside Grathan's chamber. Beelzlit had love for his mother and was prepared to defend her until they both engaged the Sith.
Following a severe defeat, Beelzlit and Cellvanta were bewildered as to why the Sith Empire sought their deaths. His mother believed the only way to survive was to persuade the apprentice to slay Grathan instead, enabling her son to inherit his father's position. Beelzlit was unwilling to let his mother perish, and was willing to sacrifice his life to protect her. The apprentice declined, resulting in the deaths of both Cellvanta and Beelzlit.
If the warrior chooses to spare Beelzlit, Cellvanta attempts to sway Darth Baras' apprentice into murdering Grathan. This is done to shield Beelzlit from danger, allowing him to proceed with his training and assume his father's role as a Lord of the Sith. Despite the warrior becoming a close friend to the Grathan family, Beelzlit makes the decision to silence him/her by dispatching Ralesk, his father's most skilled assassin, to ambush the apprentice in a hangar located within the Dromund Kaas spaceport. Ralesk's attempt ends in failure, with the Sith warrior defeating him, potentially exposing Beelzlit's secret.