Sneaky

Sneaky is one of 's physical s in Xenoblade Chronicles. It does triple damage from behind.

Overview
Compared to Back Slash, Sneaky is weaker (even given its higher from-behind multiplier) and more expensive to upgrade, but has a slightly lower cooldown. Its main advantage is that unlike Shulk, Riki has no trouble surviving the spike in aggro, so he can use it more freely. If not from behind, there's no point to it.