Attack on Titan: Mutant Systemmm

MC who was a highly-skilled Solider is reborn into the brutal world of Attack on Titan. He is reborn with a rare power and mutant system into a bloodline full of chaos. The Ackermen Clan.A war will begin. The end of the world is near. MC has prior knowledge of AOT events. [Warning] This fanfic contains spoilers to current manga chapters. Lots of R-18, Gore and Violence. The romance will build. There won't be R-18 content until later. [Extra Tags]: R-18, Incest, Advanced Technology, Spoiler Warnings,