Dark Star Saber

Mine's bigger now!

The Dark Star Saber is a weapon from the Prime portion of the Aligned continuity family.

The Dark Star Saber is a sword made from pure Dark Energon.

Fiction

Prime cartoon

Plot details for Alpha/Omega follow. Spoilers have expired, you may remove this tag

Megatron, after securing the arm of a Prime, used the Forge of Solus Prime to craft a counterpart to the Star Saber. He managed to do a really good job too, as the Dark Star Saber managed to break the Star Saber into pieces. Alpha/Omega