Ryler Dorant, also known as Needles, was a male human who was a lieutenant

Lieutenant Miscellaneous Ranks

in the Havoc Squad

Havoc Squad (Republic Special Forces Division) Organization Galactic Republic (GGW, CW and GW)

, an elite team of Republic troopers serving in the military

Republic Army Organization Galactic Republic (GGW, CW and GW)

of the Galactic Republic

Galactic Republic Organization Galaxy-Wide Organizations

. Dorant was a medical genius and was particularly adept at synthesizing powerful new combat stimulants and adrenals.
He, along with most of Havoc Squad, defected

The Separatists' Stronghold Event Cold War (3653BBY - 3642BBY)

to the Sith Empire

Reconstitued Sith Empire Organization Galaxy-Wide Organizations

shortly before the end of the Cold War

The Cold War Event Cold War (3653BBY - 3642BBY)

.
Needles eventually traveled to Taris

Taris Planet

and weaponized the rakghoul plague. With the intention of making it fast acting, he planned to test it on newly defected Republic troops, Imperial troops and captives

Capture of Republic Patrols Event Cold War (3653BBY - 3642BBY)

brought to him by the Death's Claw

Death's Claw Organization Planetary and Sector

pirates

Pirate Organization Communities

of Fallenspire Stronghold.
Soon after he finally succeeded in creating a nekghoul

Sarven (Nekghoul) (Nekghoul) Character Minor Characters (TOR)

with his newly created weapon, the Havoc Squad, led by the original member who did not defect

Meteor Character Major Characters

, managed to stop and kill

The Arrangement Event Cold War (3653BBY - 3642BBY)

Needles, ending his experiments.