Commencement

Commencement is the final stage Environment added in the 1.0 Update. It is located atop the Moon of Petrichor V and has slightly reduced gravity.

The will allow its selected Monster to spawn, but not prevent the Lunar Chimera (Golem), Lunar Chimera (Exploder), or Lunar Chimera (Wisp) from spawning.

Monsters

 * Lunar Chimera (Exploder)
 * Lunar Chimera (Wisp)
 * Lunar Chimera (Golem)
 * Void Reaver (during detonation sequence)
 * Mithrix (Boss)

Releasing the Rescue Ship
Upon entering the main area of the stage, the player will discover a Rescue Ship protected by an unbreakable force field. Their new objective will be to find a way to release the Rescue Ship in order to escape the planet.

Different pillars are scattered around the stage. The player's objective is to activate and charge (i.e. complete the holdout event) 4 of them in order to activate jump pads that will lead to Mithrix, the final boss. 4-7 pillars will spawn in total and there can't be more than 3 pillars of a given type at once. Each pillar type has its own way of charging:
 * Pillars of Mass take 60 seconds to charge
 * Pillars of Design take 30 seconds to charge and will release shockwaves during the process, pushing the player away and inflicting them with the Cripple status (-20 Armor and 50% reduced Movement Speed). The shockwaves can be avoided by repeatedly jumping.
 * Pillars of Soul take 30 seconds to charge and their charging zone will get smaller over time. The pillar's charge rapidly decreases if players leave the charging zone.
 * Pillars of Blood take 10 seconds to charge and will absorb the health of the player in the process. It will drain 10% health per second for a total of 100% over the charging duration.

After successfully charging the dropship the game is over. An ending cinematic is played during which the ship can be seen flying away from the moon. Shortly thereafter a purple sphere grows from the center of the moon before it disappears with a flash of light.

Cauldrons & Lunar Pods
On the left end side of the stage, near where the Pillars of Design spawn, there will be 5 Cauldrons, randomly selected between Common, Uncommon and Legendary. Common Cauldrons are unique to Commencement and will exchange one red item into three of the displayed item. (This area is denoted by the community as "Soup Island")

On the right side of the stage, near where the Pillars of Soul spawn, there will be 0-5 Lunar Pods that can be attached to walls and in other unusual places.

Shrine of Order
A Shrine of Order will always spawn on a floating rock behind the area where Pillars of Mass spawn (left of the map when starting from the Rescue Ship, see the Overview section).

Logbook Entry
Like the Hidden Realms, Commencement's Logbook Entry is obtained through picking up an Environment Log. Said Environment Log is located within the central hole underneath the Boss' arena. It will disappear 5 minutes after entering the level.

Trivia

 * The name "Petrichor V" was originally a fan-name made up by the community. Now it's canonically the planet's name.
 * The detonation of the moon in the ending cinematic is reminiscent of the death implosion of the void reavers. Since they are also attacking the player during the escape it can be assumed that they caused the detonation, thus imploding the moon into the void just as they do to anything caught in their on-death implosion.
 * A Glass Frog Easter Egg can be found after defeating Mithrix's final phase, during the escape sequence. It is located on the teleporter where the player originally spawns into the final stage. This easter egg was requested on the official discord. The log refers to these same "glass frogs", implying that the frog is more than just an easter egg.