Leviathan womb

A Leviathan womb is a protective body in which a singular Leviathan is born inside the deepest caverns of the planet Phaaze. The serpentine womb provides protection from other influences while the Leviathan Infant inside gestates and matures. The Infant is fed an unlimited supply of pure Phazon, which promotes growth and allows the Leviathan to develop a Phazon Core. Over decades, the Leviathan and its womb are pushed closer to the surface, as the Leviathan gets larger and older. Eventually, when the Leviathan is at full size, it is launched from the surface of the planet to journey through space, until it reaches another planet to impact and "Phazon-form". One Leviathan womb was destroyed by Samus Aran in Metroid Prime 3: Corruption.

Description
The womb itself is an organic chamber, and has two translucent Phazon plates at either side. These plates can be ripped off by physical stress. Behind the plates is a cluster of Phazon vines that secrete pure Phazon for the infant to consume. This is also where the the infant Leviathan can be found. Barbed thorns protrude from the bottom of the womb, that are tipped with Phazon. Vertically growing Phazon crystals also emerge from the womb's underside, along with several black and red tentrdils. The head of the womb extends into a long, flat, twisting body, that leads up through the shaft in which the womb resides. The body of the womb is dark and has interlocking surfaces that resemble muscle, while the underside is a fleshy pink colour. Cracks can be seen in the womb's body that glow a bright blue, and various fungal growths are apparent in places. A cicular opening in the womb's mid-section resembles an optical unit, but upon closer inspection, seems to show an exposed brain. This, coupled with the Phazon barbs, makes the womb look very similar to a fully grown Phazon core.

It is unkown if the womb becomes part of the Leviathan when it becomes too large to support, or if it is shed by the Leviathan.

Genesis Chamber
Samus encounters one Leviathan womb in the Genesis Chamber on Phaaze. This room is a extremely tall cave, that seems to stretch all the way to the planet's surface. The main part of the room consists of two ledges, with a Leviathan womb in between them. Beneath the womb is a fleshy slab that protects the Sanctum below. If Samus falls into this area, she will be bombarded with Phazon radiation flowing from the Womb that will kill her in seconds. Tunnels leading into this room allow Phazon Metroids and Jelsacs to enter. Stranger is the inclusion of many molted husks from a creature "identical to the one [Samus] faced in the Impact Crater on Tallon IV". These husks can be seen upon various ledges leading up the cave's shaft.

Samus removes the plates on the womb to attack the vulnerable Leviathan Infant. The Infant shifts to the other side of the womb, but Samus continues to shift between sides and her continued attack causes the Infant to explode, destroying the womb and removing the Phazon slab covering the hatch to the Sanctum.