Phantasm

The Phantasm is a craftable Bow can be obtained after defeating the Vortex Pillar.

The bow fires 4 arrows at once, giving it sizable DPS. In addition, when focusing on one opponent, the bow fires a continuous stream of arrows in between attacks, rewarding players that land multiple attacks in a row.

This bow can achieve well over 4,000 DPS on a single target, making the Phantasm the highest DPS bow currently in-game. The Phantasm's best Modifier is Unreal.

Trivia
The Phantasm's downside is that if there are multiple mobs that cannot last against more than 2 volleys, you are unable to use its passive to its full potential. The Vortex Beater's area control trumps the Phantasm in this regard.