Undertale Last Breath™ Inc., which I’ll refer to as “Inc.”, started as a parody of edgy, out-of-character Sans battles. There isn’t really a story. The lore is just identical to UNDERTALE: LAST BREATH [LEGACY], except Sans lasts for 100 phases, which all increasingly get more and more ridiculous as it goes on. Inc. is usually split into “Acts”, usually called Revival Points. Included are “AU Phases” where characters from different AUs show up to help Sans while he’s in Lost Soul form. AU Phases last from Phase 40 to Phase 70, and sometimes included self-insert OCs. Multiple popular UNDERTALE SoundCloud artists were featured in the project, as the majority of phases are other MEGALOs of some sort. Inc. has no original songs, just popular SoundCloud UNDERTALE tracks. A formulating story behind the scenes was that Mr. Last Breath wanted to try usurping ZerJox as the true creator of UNDERTALE: LAST BREATH, before he was seemingly defeated after a 3-phase EarthBound battle. This story was told in the sequel account, “Mr. First Breath”. Inc. also included a Timeline B, but it never got as far as Timeline A before the entire AU was deemed “finished”. Not all 100 phases were completed in Timeline A, but the AU was deemed “finished” by its creators. A new reboot was made by kaeffe, which goes up to Phase 43, but progress on the reboot seems to have stopped. There have also been multiple takes of Inc., such as B2G!Inc., GTH!Inc., Still Breathing, and so on.