Sylvn was the daughter of Ki-Adi-Mundi and his fourth wife, Mawin. She was a good girl in spite of her anger, bitterness, rebellion, and thinking the whole world should crown her empress-for-life; or, as her father preferred to call it, "high spirits".
Around 33 BBY, Sylvn unknowingly became involved in a smuggling ring involving Ephant Mon, one of Jabba the Hutt's agents, and one of the Cerean Elders. When this deal went sour, Sylvn, her boyfriend Maj-Odo-Nomor, and her friend TwinTwin were trapped on a freighter carrying 2,000 adult divviks along with Ephant Mon. When her father, Ki-Adi-Mundi, came to her rescue, Mon threatened to blow them all up. Maj-Odo-Nomor tried to stop Ephant Mon, but was shot. Manually opening the outside hatch, Ki-Adi-Mundi managed to save his daughter. Unfortunately, Ephant Mon was saved as well: he proceeded to enslave both Sylvn and her friend, Twin. Ki-Adi-Mundi eventually rescued the duo from being executed during an electrical storm.
Sylvn, together with the rest of Ki-Adi-Mundi's family, was killed in the Battle of Cerea during the Clone Wars.