This article's content is accurate to the most recent public game version, 0.4.8d.
"Pierces an enemy with razor-sharp feathers. Strong Sharp attack."
Cost: 5 TP
Source: Equipping the Mimic Core.
Razor Feathers is a skill that deals strong 
Sharp damage to a single enemy target.
This skill can be useful as an additional source of sharp damage which is rare but would do very little on a mage. It is recommended for either Veronica or Eric(a) as Alice can already do sharp damage on her own through her skills or a knife weapon, and Natalie does not build as well for ATK.
The following enemies can cast Razor Feathers: