Moon Butterfly Wings

Moon Butterfly Wings is an armor piece in Dark Souls II

Description
Pinions made from wings of the rare moon butterfly. Poisons those who approach its wearer. Also extends jump distance.

Little is known about the moon butterfly, which only appears on full-moon nights in winter. Some say the butterfly is a magical being, and its larvae have never once been spotted.

Effects:

Poisons nearby foes.

Increases length of jump.

Availability
Can be bought from Maughlin the Armorer after spending 16,000 souls at his shop.

Effects
The Moon Butterfly, like the whole set, poisons any nearby foes. (including NPCs) However, unique to the skirt, and wings, tapping the roll/sprint button will instead do a jump. (sprinting can still be done by holding down the button after the jump) While this alone makes jumping easier, it also lengthens the jump, allowing players to traverse gaps more easily.

Also, though it is not stated in the description, it also reduces fall damage, allowing the player to jump down to the first plank, in the Deep Pit taking just about as much damage as when wearing the Silvercat Ring.