After Nicholas Raine is rescued by Dan and brought back to Ray's Oasis, Phallinx describes Feltrite, a rare ore contained within 99942 Apophis. He advises Nicholas to keep any Feltrite Crystals found, on account of their usefulness while engineering items.
Following completion of the quests Destroy the Bomb Caches and Feltrite Crater for Mayor Clayton and Sheriff Black, the quest A Proposition will be posted on the Job Board in Wellspring, which involves Raine seeking out Phallinx at the Hagar Settlement. When approached, he offers the RC Prototype quest in which Nicholas must return to the Shrouded Bunker and acquire an advanced RC Bomb Car prototype. He rewards Raine with the schematics for the advanced RC bomb car.
- Phallinx was voiced by American actor Brian Bloom, who also provided the voices of Clint and Sid, and "William Joseph 'B.J.' Blazkowicz" from Wolfenstein: The New Order, Wolfenstein: The Old Blood and Wolfenstein II: The New Colossus.
- In the Wasteland Legends mission Life in Prison, one of the two playable character models is Phallinx's.
- Some of Phallinx's dialog refer to "strange noises" coming from below the settlement, referring to The Scorchers expansion pack.