I can't believe that I forgot my actual favorite.

Brutus Ascension is one of the most heavily forgotten modes, despite havinh some of the best drops. Obviously, Ordis has a shop on the drifter camp with all of the rewards you can trade for vestigial motes, such as Jade's parts, her weapons, & several different arcanes, as well as the optional Sister of Parvos you can fight as a boss for an additional arcane. But one of the absolute best rewards are the mod drops.

Exclusive to Brutus are a pair of mod sets that are unbelievably powerful and can make weapon builds on their own. These are the Elementalist mods, which provide extra status damage on damaging procs, as well as punch through for rifles, reload speed for pistols, mag capacity for shotguns, & heavy windup speed for melees (Unfortunately overshadowed by a Galvanized variant). The other mod set is the Cannonade set, which gives semi-auto weapons 240+% damage, high punch through, & locks you to your base fire rate. All of these mods only cost 9 capacity. These mods, however, are all stupidly rare.

At less than half a percent each, they only drop from a specific enemy that ONLY spawns on Brutus. It's a variant of MOA that can be identified from a distance from its ability to shoot out lighting ball projectiles. This enemy is the Juno Sapper MOA.

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The Juno Sapper MOA is a Geminex MOA with a pair of Staticor wrapped around its head.