Pure Nail

The  is a melee weapon based on the weapon used by the playable character from the game Hollow Knight. Its combo and attacks are an exact copy from its source material, including the capability to bounce off spikes, a first in Dead Cells.

Location
In the Prisoners' Quarters there is a chance for a lore room to spawn with a bench in it from the game Hollow Knight. When examining the bench the nail drops. Picking it up will unlock it permanently.
 * "This place feels so... peaceful."
 * "I feel like sitting on it would be a great relief."
 * "It's good to be right."