Slipping into a stance, Reaven maneuvers his blade in such a way, that there seems to be two of them before striking forward, attempting to hit the orc.
Spoiler: OOCSwift action to enter child of shadow, then use Shadow blade technique.
Strike 1 to hit(1d20+2)[21]
Strike 2 to hit (1d20+2)[7]
Crit confirm if needed (1d20+2)[7]
(1d6+1)[7] for damage, double if critical
Cold damage if possible (1d6)[1]
I'll go with the higher roll.