Nexus

I was led to understand that under the new Lore style, the League of Legends doesn't exist. In that version, I would think that the Nexus's are not critical to the lore, and possibly don't even exist.

I do believe that the nexuses exist even after the "lore changes", they are an important source of magical energy... and we can see a nexus on the video of a new dawn (And the map of Kalamanda still canon, same with the Howling Abyss and the uglytreeline.

Remember that the nexus will be visual updated in the new map, and they removed the sumoners statues. So the magical crystals of energy are part of Valoran.