In the new timeline it's where Gcatavrosprite and Davepeta are created, and also where Jake fights against the Felt. What remains is currently in Derse's previous orbit. The planet suffers serious damage in its collision with LOTAK in the battle between the Condesce and Aranea Serket.
Karkat Rose, WV, Kanaya, Dave, and Terezi are teleported to this planet from their speeding meteor to meet with John, either by Jade or Gcat (both under the Condesce's control). It is the planet which the Prospitian battleship lands on after its arrival in the new session. LOMAX is first seen during Act 6 Act 4, as Jake is exploring his planet. Barrows and stone circles were both made in northern Europe in a similar time period in the real Earth. The planet is also covered in green burial barrows, which are presumably the tombs of the Iguanas. There are also red post and lintel structures that resemble the Stonehenge standing stones (or other stone circles) peppering the planet. LOMAX and the undead imp-like creatures, also showing the dark red standing stone circles. The archaeological explanation is in line with Jake's love of adventure. There are many shelves/steps dug into the ground, reminiscent of the remains of terraced agriculture. The planet is cut into quarters by some oddly angular canyons filled with clouds of purple gas (likely electrically excited xenon itself). There are hordes of undead on the planet, which are the session's Underlings, including a Basilisk-like skeletal creature crawling over a barrow and some smaller skeletons resembling Imps.
It is very green, of a shade resembling L ord English, and apart from the purple canyons and clouds closely resembles Alternia's green moon. The planet shares themes with the rest of the sessions' planets of burial places and noble gases, representative of the dead end/inert nature of their session, as well as the fact that the Heroes are called Nobles in such a session. The Land of Mounds and Xenon, abbreviated as LOMAX, is Jake English's planet.