The Time Catchers

The Time Catchers were tall cloaked figures with claw-like hands that appeared in the universe of ERAS, A Doctor Who Fan Series. These beings are linked to time itself, acting as a form of "antibody" to cleanse infections in the timestream. In the event of a temporal paradox, the Time Catchers will be drawn to it and will sterilise the wound in time by devouring everything in sight

Biology
The Time Catchers are dark wraith-like creatures used by the Ministry of Time to guard the Time vortex. They served as the primary antagonists of ERAS: Within the Light, of ERAS, A Doctor Who Fan Series. The Time Catchers had the ability to break through stone. They lived in the Time Vortex, as well as, the Morass and the Reapers.

The Time Catchers would search out disturbances in time, such as temporal paradoxes, leave the Time Vortex and "sterilise" the area by devouring everything. They devoured creatures through touch by absorbing their life essence; leaving no trace. The Time Catchers, unlike Reapers, did not have the ability to deactivate TARDISes as to not allow for an escape from their traps. But, they could break their way into TARDIS interiors to reach those inside if the need arose.

According to the Alternate Eleventh Doctor, there was nothing in the entire universe which could harm The Time Catchers. Despite these powers, The Time Catchers were material creatures, at least in this world, and could be blocked. They were also slow moving, and could barely keep up with the Alternate Eleventh Doctor and Oliver Howell. They could not pass through solid objects, as these were effective barriers. As damage to time in the form of time paradoxes accumulated, it allowed them entry. They could also be banished if the timeline was repaired. If this happened, everything would return to as it was before and memories of The Time Catchers would disappear, unless of course, you were a Time Traveller.

Appearance
The Time Catchers appear as tall (around six to nine feet in height), ominous figures who wear black cloaks, and glide gently above the ground. A Time Catcher's face is unseeable. Their skin is black and covered with scabs. Their skin has a slimy texture, as if something had decayed in water. Normally they only show one hand with clawed talons, which is used for sucking the soul out of the victim, and clearing them from time if they have enough exposure to the Time Catcher.

Anyone who has seen what is under a Time Catcher's hood is in no fit condition to tell what they saw. The only acception to this is the Doctor themselves.