Vengess Empire Planet was chosen by Wrathia Bellarmina for her palace to be built on because of the abundance of Florem Mortem that grew there (source needed). Vengess lived there under Wrathia's rule until TITAN conquered the planet.
The planet is both full of Florem Mortem but it also had large deserts, warm oceans, and dry grassy mountains. The planet had constructions of varying sizes.
Fifteen years prior to the beginning of the story, Wrathia alongside Pedri ruled over the huge empire located on said planet. The two had an heir together, an egg that would take 20 human years to hatch. Their empire was demanded to subjugate to TITAN. He suggests to Wrathia that they take a stand against TITAN when he threatens to destroy their empire, since surrender would not guarantee survival. She concocted a plan in which she and her greatest warriors would be reborn as new lifeforms in order to enact their revenge on the conqueror. Facing off against TITAN Wrathia cosumed her wine dying on the planet.
It is unclear whether or not Wrathia's home planet has been reformatted by TITAN, or is currently even inhabited by the Vengess. It is unlikely that they still inhabit it, as TITAN forces are seen overtaking the planet.