Overlord Tamer:I Only Tame Bosses

Lucas was given a second chance at life.Reincarnated as Oliver Overheart, he discovered a world ruled by tamers and monsters, where strength meant everything.But just like his previous life…he failed again.Born without the ability to tame even a single monster, Oliver was labeled a disappointment.Until a message appeared.[Tame the boss monster, and the system will approve you.]“…I can only tame boss monsters?!”With this forbidden power, Oliver begins his rise, from a nobody to a being who commands calamities.Because in this world…The strongest monsters were never meant to be controlled.----Boss monsters only, no weak summons-smart MC-monsters evolution-slow burn to OP with real consequences-unique card system-Harem!---