Chronokinesis is the ability to move time in any direction, move yourself through time, and control time itself. It is a very rare, very powerful and very dangerous power and as such, only a few characters have possessed it.
It should be noted that this ability requires alot of power behind it (if done collectively, it will weaken said collective) so if a witch is capable of performing such feat single-handedly, they themselves are extremely powerful.
The evil witch, Sam Roberts, is the only known witch capable of using this ability without any help albeit it limited. Sam is able to slow down time of a specific area and when in extreme distress can freeze time in a small area for a short period. Due to Sam being on Ava's side, he is feared by the Known coven.