 If you liked
Hunter x Hunter
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 ...then you might like
Kyokutou Chimeratica
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Anyone who love the Chimera Ant arc of Hunter x Hunter should read Kyokutou Chimeratica (KKC).
KKC and HxH both has a Hunter Association that tries to fight mutated creatures called "Chimeras." The formation of Chimeras is very similar in both series as well (primarily through "phagogenesis"). Both series feature a young hunter protagonist who is surrounded by powerful Hunters.
KKC is a fantasy monster-hunting manga and the adventure seems very close to what Togashi teased would take place in HxH's Dark Continent Saga.