Lock and Key

When the Collector, a Riftling hybrid, first came into contact with the Rift behind Stephen Patrick's house, he subconsciously absorbed it into his person and manifested a lock and key. By inserting the key into the lock, one could either end all of reality or fix some of the effects of Dimensional Bleeding, which was being caused by the Slender Man. When Collector inserted the key, everything around him flashed white and he, along with Josh Harris and several others, found themselves back in their own respective universes. Although the lock and key may have prevented Dimensional Bleeding to an unknown extent, they did not get rid of the Rifts that it had formed. When the lock was later broken by Josh Harris, the Rift that Collector had absorbed reappeared several minutes earlier in time from the point when the lock was broken. As a result, the being within the Rift was able to emerge from it.