At the beginning of existence there were two things
A crystal of creation and light
And a creature of destruction and darkness
The creature wandered the newly created multiverse destroying anything it could see
While the crystal flowed with the sands of time, eventually landing in a universe not much different from our own
Eventually a man who's name was lost to time found the crystal, and the moment he touched it the creature was weakend, eventually becoming Mr. void
As the man learned about the crystal he found he could bend reality, control time, create matter, and eventually travel the multiverse
Soon he became known as the collector, being considered one of the most powerful beings in the multiverse