The Annihilation

The Annihilation is an Expert Mode-exclusive accessory dropped from The Annihilator when defeated in the Etherial Dimension. While in the Etherial, killing an enemy grants the player the Annihilation buff for 10 seconds, which increases all damage types by 20%. If the player kills another enemy before the buff wears off, the buff is reapplied and the boost is increased by another 20%. The boost cannot exceed 100%.