In Remnant 2's Dark Horizon DLC, you'll have access to a unique new game mode called Boss Rush. In it, you'll be able to fight a succession of named Aberrations and bosses to farm some resources and relic fragments in a Rogue-like rapid-fire boss battle.
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Boss Rush is a boss-by-boss trial run used to collect items in a way that really takes away the worst RNG parts of trying to collect said items. There are three levels of Boss Rush, each with more bosses than the previous level and more rewards as well. You can enter this mode with your current character or a brand new one; to access it, you need to interact with the large glowing portal stone in Ward 13 and then click on World Settings. Boss Rush will be in this menu. Here are all three levels and what they require to complete.
In each of the above trials you can also choose a difficulty level. Higher difficulties give better rewards and more XP. These are:
The first thing you need to do is take out some normal enemies and an Aberration elite. After the Aberration is dead, you will have a short grace period where nothing spawns to give you some time to find the Power Pylon and any treasure chests. Once you have all the items cleared, you can either move on to the next room or you can stay a bit longer to farm Mod powerups or ammo for the boss.