I Swallowed the Zerg Overmind's Egg

Trapped in the squalid underbelly of a ruined metropolis, low-tier fighter Ryker bleeds in subterranean combat rings to purchase life-saving medicine for his ailing sister, Lena. Pushed past human limits, he ingests an ominous hive monarch embryo supplied by black-market syndicates. The creature awakens horrifying bio-mechanical strength inside his veins, allowing him to smash through aristocratic champions. However, every brutal victory accelerates his physical transformation into an unthinking beast. When hidden evidence connects his sister's lethal sickness to an imperial genetic breeding scheme, Ryker must fight an approaching swarm while battling to maintain his vanishing human mind.