The phantoms were such that the main characters could be walking around in the wilderness, no enemies in sight, when suddenly they're besieged out of nowhere.
So the movie has next to nothing to do with the games its based on... the games that also have next to no real relation to each other beyond the title.
...and some kind of fantasy setting in an imaginary world. Placing your first movie adaptation in After the End Earth may not have been best move.
