Regnum Caelorum Et Gehenna

Regnum Caelorum Et Gehenna (Latin, "Realm of Heaven(s) and Hell") is a melodic death metal band from Japan, formed in late 2011/early 2012, although one source (Metal Kingdom) claims that they were formed in 2010. This band was formed by (former) members of Stratiotes. Besides melodic death metal, their sound and subgenres have been labeled as progressive metal, progressive death metal, (melodic) metalcore, and others. They have released 2-3 full-length albums and one early demo throughout the 2010s. They have done a collaboration with Φnality Blast to make a split EP. They also have a song made for/selected for a TV series (anime) named Kengan Ashura in 2019/20.

"Line-up (members, from Stratiotes)
アルベルト・オブ・ジョイトイ (Albert of Joy Toy): Vocals (2011 ~)
Mr. Sweden : Guitar, Bass, Synth, Key, Drum Manipulator (2011 ~)
ケンカワ (Kenkawa): Guitar, Bass (2011 ~)
ノーザン・キラー (Northern Killer): Guitar, Bass (2012 ~)" -Metal Kingdom, song credits on YouTube uploads of their songs

"Regnum Caelorum et Gehenna means ''Realm of Heavens and Hell'' in Latin.

"The Gehenna is a historic valley that surrounds Jerusalem. The name originates from the Koine Greek transliteration (Γέεννα) found in the New Testament.
It is first mentioned in the Hebrew Bible as part of the border between the tribes of Judah and Benjamin. Later, King Josiah made it a landfill, where a continuous fire burned; thus, in later rabbinic literature, Gehenna came to represent a place of punishment, where fire burns the sinners." -Metal Archives