Vastus is a little younger than Tarix, Kiina is quite a bit younger than Tarix, but older than Gresh.
The Book of Certavus is currently in Berix's possession.
EMPIRE OF THE SKRALL
Greg, on the baterra's ability to vanish: "Works like this. You and a friend are walking through a forest. One of the trees is actually a shapeshifted baterra. It turns back into a baterra, attacks your friend. When you turn to see what's happening, it's a tree again, so it seems to have vanished."
The baterra did not exist before the EP war. EP was not involved in their creation, and they might not even be biological beings at all. There is a reason they are so hostile, and they do not necessarily target only Skrall.
Branar looks like a standard Skrall soldier.
Surel is younger than Tarix and Certavus.
Surel's biomechanical wolves are very old.
During the war Element Lords were commanders of Glatorian.
Element-based tribes existed prior to the Element Lords.
Most special forces Skrall have names, but not all.
The baterra's weapons shapeshift with them, as appendages of their body.
GENERAL
The inhabitants of the Red Star have always resided there, and the Great Beings are aware of them. They are not baterra, Element Lords, or Great Beings.
Mata Nui's creation was indirectly related to the EP war.
The movie does not at all explore events prior to the Shattering.