Bruce was taken by Darkseid through the blast tube towards Apokolips, they were as Darkseid said, teaching holograms and seeing planets, timelines and dimensions, and Bruce shared what he knew about alternate dimensions.

There was a kind of hall, a planetarium and interdimensional maps, which Darkseid spoke of every dimension he had visited and conquered.

Using his knowledge of timelines and the future, Bruce reported on dimensions he visited with Justice League missions.

Bruce shared with Darkseid, as the new god shared with him, of course he didn't say everything, just the main things.

- You traveled back in time when? – Darkseid questioned.

- It was in the dark...