Concealed Weapon

Concealed Weapon is a Nightblade Class skill, found in the Shadow Skill Line. A decent spammable ability for Magicka Nightblades, that also boosts speed when sneaking.

Concealed Weapon
2295 Instant Cast Target: Enemy Base Skill: Veiled Strike
Slash an enemy, dealing 2323 Magic Damage. Attacking with Concealed Weapon from the flank stuns the enemy for 3 seconds and sets them Off Balance. While slotted, your Movement Speed while Sneaking or invisible is increased by 25%.

Concealed Weapon is a morph of the Veiled Strike base skill. The other morph is Surprise Attack.