The Devastator was originally going to be General Reiko's weapon in Mortal Kombat: Armageddon. However, the MK team decided to give this sword to Fujin in the final version of the game, for unknown reasons. Giving Reiko the Crude Hammer instead.
This massive sword was obtained by the wind god Fujin and used against the Forces of Darkness to help prevent Armageddon. In gameplay, Fujin's Devastator uses similar attacks to Kenshi's Sento. In addition to being wielded by Fujin it can be selected as a weapon for Kreate a Fighters under the Swords weapon type.
It appears again in MK Mobile, as an Epic Equipment Kard. It was introduced in Update 1.11 and can be bought for 450 Blood Rubies in the Faction War store. It's Tier 1 appearance has it looking quite similar to a claymore, while its Tier X appearance being the familiar great sword albeit with a very different design.