Hell's Core

Hell's Core (ヘルズ・コア Heruzu Koa) was a room located in Cube known as Tartaros's point of rebirth.Fairy Tail Manga: Chapter 380, Page 7
==Description==
Located somewhere in the floating island Cube, Hell's Core is used as a laboratory that Lamy manages and where Demons are born, as was the case of Minerva Orland and Doriate who were originally Humans modified into Demons, and also reborn, as was the case with Tempester and Jackal whose bodies had completely perished in previous fights.Fairy Tail Manga: Chapter 370, Pages 9-12 According to Lamy, this is because of a contract made with the Underworld King, making Tartaros an immortal Guild. 
Once a Demon of Tartaros dies, they're respawned within one of the tubes in the lab regardless of when or where to begin the regeneration process, normally this would take about a day, but the process will take longer than normal when other tubes are occupied.Fairy Tail Manga: Chapter 359, Pages 2-5 The entire mechanism seems to be controlled by a Demon with tentacle-like extensions prying into the tubes that Lamy uses to oversee the regeneration progress. The lab is also capable of modifying one's appearance, to either look handsome or a grotesque creature. These tentacle creatures injects the recipient with a Demon Factor whilst modifying them. However, this lab has no effect on those with taken over: Satan Soul such as Mirajane Strauss, who already has this factor for her Magic.Fairy Tail Manga: Chapter 370, Pages 9-14
Mirajane then proceeded to use her Magic in order to destroy Hell's Core, ending the Guild's immortality.Fairy Tail Manga: Chapter 380, Pages 8-12
==References==
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