You sprinkle the dust of a Faerie's wings on your arms. You incant Ankou's name, and with a wicked crunch, your ulna and radius rip from the flesh and muscle in your body, forming a razor sharp scythe-like blade of bone. A thin purple and black blade comprised of malignant energy surround the sharpened bones.
You gain two light, one handed, finesse weapons that cannot be disarmed and last until your next long rest. They are retractable and extendable as a free action. All that's left is a wicked gash that runs along the top of your forearm. Your arms continue to function as normal, being aided by the magic incanted in the spell. You are proficient with these weapons.
These weapons count as the same weapon if used with the Warlock's pact of the blade Pact weapon feature.
These weapons deal 2d8 Psychic damage each. In addition, when you use the sword to attack a target that is in dim light or darkness, you make the attack roll with advantage.
At Higher Levels. When you cast this spell using a 3rd- or 4th-level spell slot, the damage increases to 3d8. When you cast it using a 5th- or 6th-level spell slot, the damage increases to 4d8. When you cast it using a spell slot of 7th level or higher, the damage increases to 5d8.
* - (Dust of a Faerie's Wings)