The Preon Accumulator is an equipment introduced in Risk of Rain 2. Activating this item begins a short charge-up period, during which green light starts glowing out of it. Once the charge-up is completed, a powerful orb of energy is launched in the direction aimed.
The orb consists of preon tendrils, and zaps enemies within a 35 meter range for 600% damage. When the orb hits an enemy or the ground, it detonates in a massive 20 meter explosion, dealing 4000% damage to enemies.
This awesome firepower comes at a cost, though, as the cooldown period is 140 seconds.
As with most Equipment, the Accumulator is located either over the players right shoulder or directly above their heads, depending on character.