We know about Nelfarian's Lair where the Uncorrupted Eggs are pulled from the Past (Thus altering the Timeline and creating a new Timeline where those 3 Eggs don't exist.) Then there's also the Battle of Hyjal which lead to us defeating Archimonde without destroying the tree. The War of the Ancients where Khadgar, Krasus and Brox are all sent to the War of the Ancients. Well of Eternity where Nozdormu takes the Dragon Soul.
Well, we know MANY exist, firstly Chromie's timelines where she's killed by the Master. So, in the screenshot you showed, that unless a Timeline is maintained OR altered, it ceases to exist. The concepts of distance and time have no meaning in the Emerald Dream: Their collision created Primordial Worlds without number. A sentient non-existence that wants to destroy the light to devour all matter and energy. There are beyond the confines of space and time. Shadow/Void created the Void Lords and The Old Gods who can induce Chaos in entire realms of existence. There are countless universes in existence possibly infinite. The light and shadow collision created all of the existence including all the concepts.
