Board Thread:Roleplay/@comment-26120744-20170805220307/@comment-27661770-20170806002355

(Basically they keep universes from falling apart. Most timelines aren't marked for certain events and whenever one of those events is about to happen in a no-mark timeline, they send someone to rectify it. Most common type is a CORE overload, mainly because that's the least-marked type and it's fairly common.)