Reaper
Reapers were dragon-like creatures that were linked to time itself. They searched for temporal paradoxes and would remove the offending element.
Biology
They had red eyes, two wings, two claws below their wings, mouths on their chests, tails that resembled scythes and dark brown, tough scaly skin.
Reapers would search out time disturbances and leave the Time Vortex to sterilize the area affected by devouring everything. They were more interested in sentient beings than inanimate objects and the older the object, the stronger it was against them. They devoured their prey through their mouths and left no trace. They released a golden glow from their eyes and under their skin when attacking.
There was nothing that could harm the Reapers although they can be blocked since they could not pass through solid objects, especially older ones. They could also be banished if the timeline was repaired. If this happened, everything would return to as it was before they arrived and memories of the Repears would be erased.
Appearances
Father’s Day (TV)
The Crimson Hand (Comic)
The Eleventh Hour (TV)
The Four Doctors (Comic)