Starfury

Starfury (sometimes mistakenly referred as Starfur) is a sword usually found in chests on floating islands. Swinging the sword causes 3 stars to fall in exchange for a portion of your mana. The stars will pass through where your cursor is aimed. The stars also come from the corner farthest from your cursor, and because of this can not be used underground. The sword deals a base damage of 15, while the stars deal additional damage. The sword can not be swung at all when you do not have sufficient mana. Although this item can be very useful, when indoors, you will not be able to hit the units as the stars will just hit the roof of the building. So it is best used outside where there will be no roof to destroy the stars.

This can be useful if you are trapped inside and need to attack mobs on the outside.