Whoever was the architect of this Eater of Worlds prestige should be fired. This has to be one of the dumbest ideas for end game content in any RPG, MMO, looter shooter, or whatever you want to call Destiny 2. Their content is constantly underwhelming and the only way they get past being a walk in the park is handcuffing the player with bullshit that doesn't make the game fun or challenging.
What's different about the prestige version for Eater of Worlds? Prestige Raid Loadouts.
Light Level: 330
Weapons:
Kinetic: Pulse
Energy: SMG
Heavy: Grenade Launcher
Modifier: Prestige: Arsenal - Weapons have no reserve ammo. Emptying the clip of a weapon refills the clips of your holstered weapons.
NOTE: That modifier description is ambiguous. The next weapon will reload. So you'll go Primary -> Secondary -> Heavy all the time, emptying your primary will never grant you heavy etc.