Singularity Cannon
Singularity Cannon is a post-Plantera gun that can be obtained from the Doomsday Chest in the Dungeon using a Doomstopper Chip. It shoots a void blast which creates a small void portal that lingers on impact with enemies for a few seconds which deal continuous damage until it dissipates. Unlike most weapons, this weapon doesn't need to consume any ammo.
Its best modifier is Unreal