The Iron Heart

Shiro 'Einar' Hazuki - was an member of neon lunatics, who saved cykopath, reddox, magy, ellyn, tela, myo and the other children who've been suffered by dr. Gacha and Mr whales for using as "weapons" as she survived from collapsing building she met cyanthia, and raised her to be colded hearted and immortal necromancer, Shiro's real parents are Neva (Father) and Ash (Mother) she lives in Mt. Everest to be known as called.. "Chomolungma" where snow leopards live.. Shiro became the chosen unit by summoner and she became loyal to him, but then Shiro became envious because of nekohime and melnya the summoner decides to "replace" her and she got in breaking point, after she was neglected, insulted, bullied, threatened and command worse, she even got her scar in her left eye cause of the summoner's sword, after Shiro has breakdown an red aura appears looked like an red snow leopard with black fur glowing red spots and eye, she decided to accept her fate as an "corrupted", after she received her new power she decided to destroy and kill all nekos in village by offering the shadow units to kill them without calling the summoner, after she successfully kill all of the nekos and destroyed the village, she decided to leave and never return, one year she met neon and merupo and decided her to be an bodyguard and assassin, after she agreed to join the shadow of corruption she met Shadow vinyl, phantom, and lith as working together to destroy and corruption all units and owning the world

The actual title of corrupted shiro's snow au series is called 'The Iron Heart'