Riff's Dimensional Ripper

Alter: This roughly forged dagger of goblin make has somehow been enchanted with weak, planar magic. This magic dagger has 4 charges and regains 1d4 charges daily at dawn. While holding the dagger within 5 feet of a creature at least 1 size large than you, you can use an action to expend 1 charge to create and slip through a brief planar tear, reappearing in an unoccupied space within 5 feet of the creature on the opposite side of it. When you do, you can immediately make one weapon attack with this dagger against the creature. If the attafck hits, that creature takes an extra 1d6 force damage and can't take reactions until the end of your turn.

If using the dagger in this way would cause you to move more than 20 feet, you are shunted out of the planar tear and reappear in your original space. When this happens, you take 4d6 force damage, and the action is wasted.

Attunement: Yes
Rarity: Uncommon
Type: Dagger
Cost: 275gp

Griffons Saddlebag, Vol II