Solas Tempus has discovered evidence that points to a single organization of unknown origin that performs the changes to the timeline. Numerous encounters have lead to surprisingly little information on them or their ultimate plans.
Because a name isn't known for the group, they have been given the codename of Onyx.
References to the initials HWTO, as well as Kark'nof Ohm have been found in various operations but their ultimate meaning is unknown.