Genesis

Genesis is a weapon trait that refills the magazine from reserves whenever the weapon fully depletes an enemy's shield. Energy weapons also regenerate ammo on hit when their element matches the target's shield, so the trait rewards matching the damage type to the enemy shield.

It rolls on many weapons, including Grenade Launchers such as Typhon GL5, and on Xenoclast IV. The Enhanced version improves handling.

Genesis is most useful on weapons that spend a lot of ammo on shields, because a shield break gives you ammo back and keeps the weapon firing. Note that the energy-weapon refund only applies when the element matches, so mixed-element loadouts get less value.