Maelstrom weapons are unique weapons that have a bonus which procs off a specific ability for each type of weapon (Bow, Melee, Staff). These weapons only drop from the final boss in veteran mode (one weapon per vMA completion). The drops are RNG based, with a chance to get any weapon in any trait each time you beat vMA.
Each weapon is bound on pickup and drops in the Maelstrom motif style.
The Maelstrom's Bow: Increases the damage Volley deals by 161 each tick. This bonus increases by 56 every time Volley ticks.