Check out my review of the hilt; it does in-depth on the lore of its inspiration.
h2soy Reliant Review
And if you don't want to hit the link:
Lore
The design of the Reliant is inspired not by an actual “in-canon” saber but instead by a pair of sabers that only appeared in promotional material for the video game “The Force Unleashed II.” The main character, the clone of the previous game’s protagonist Marek Starkiller, is shown on book covers, video game box art, and in the graphic novel adaptation of the video game as wielding two sabers (from which the Reliant is derived) that never appear in the video game itself. Intriguingly most cosplay I’ve seen favors the promotional material sabers, a testament to the power of a striking image trumping the actual content from the media source. As such, this saber has no “real” lore as in the game the Starkiller clone wields sabers that look nothing like the Reliant.