Warp Travel is the technology the AI leave their creator-species before their departure.

Warp travel is AI tech that species acquire as a result of producing a successful AI. All species who have warp travel are, as a result, creators of AI. None of those species, however, has been able to fully reverse engineer the mechanics of warp travel.

The AI section documents existing artifical intelligences.

Warp travel allows for a small set of space to interchange itself with another small set of space, regardless of whether that space is situated in the current universe or another. Alongside warp travel, the AI left an elaborate coordinate system describing how to navigate (within reasonable limits) the Void in order to find universes.

The Void is the 'space' between universes in the Multiverse.

Warp travel has been criticized as potentially killing the original user and creating a copy at a given location, but tests of the travel protocol have revealed that the designated space to transport is in fact not disappearing altogether, but moving, perhaps into a higher spatial dimension. Warp travel technology is otherwise still not understood.

It's possible warp travel is 'gifted' to the creator-species as a way of decreasing the Multiverse's predictability, as future simulations are much more difficult than past simulations for AI, especially if these predictions are made over multiple universes.

The Multiverse is the collection of all universes in the third dimension.