The river of time.
Unceasingly flowing through the past, the present, and the future. It irrigates all worlds with its reality.
It connects the beginnings with the ends seamlessly. It pairs up with space and supports the existence of all that exists in the multiverse.
The river is ever-flowing. The time is ever-changing.
The river of time flows through all the fabric of existence and allows things to be born, prosper, and die in an endless cycle. Without its ever-flowing nature, everything in existence would be nothing but a lifeless oil painting.
Everything living and otherwise is akin to a small fish in this ethereal river that gets carried by its currents and eventually reaches its destination.
There are rules for traveling in the river of time. Nobody is allowed to swim in reverse or swim ahead of the current. Nevertheless, there are always exceptions to every rule.