Diving the Blue

On a post-apocalyptic Earth scarred by asteroid impact, humanity clings to survival in corporate-controlled fortress hive cities. Crammed in alongside alien species drawn through dimensional portals, it's socially stratified and watched at every level. Kiera is a broke baseline nobody, invisible to larger powers until a gang heist goes catastrophically wrong and leaves her bonded to an experimental symbiote. Now she's changing into something that society doesn't have a name for, hunted by mega-corporations, and tangled up in the dangerous politics of portal divers and mana-wielders. — Description from novelcodex.org