Razorclaw, Reaper of Angels, is a Super Unique Armored Destroyer found in the very end of the Gardens of Hope Second Tier in Diablo III. It only appears in Campaign Mode.
Instead of falling from the sky, it waits on the ground near the portal, even before players destroy both Hell Rifts. Killing it is not required for the quest, but Tyrael, if he spots this monster, will not speak to players until the combat is over.
In combat, it has Fast, Jailer and Electrified affixes, and in addition has triple attack speed.