In Weapon X (2nd series) #10, his mind was virtually wiped clean by Cable's telepathic power. He was apparently still alive enough to be depowered, as confirmed in New Avengers (1st series) #18. His powers were restored in X-Factor (3rd series) #20 by Quicksilver, but he fled into the Brimstone Dimension when his abilities began to destabilize. He eventually returned in All-New X-Factor #1-2.
The Tradesman enhanced Reaper's scythe so that is could be used to displace individuals through dimensions. His time in the Ultraverse extended from All New Exiles Infinity until Ultraverse Unlimited #2.
Reaper's true name was revealed in X-Force (1st series) #26.