i have read Reverend Insanity and i am craving for something like that in which mc is ruthless , cold and cunning
If you can deal with the MC starting out as an idiotic murder-hobo then I'd highly recommend Everyone Loves Large Chests.
Way of the Devil, Emperor Has Returned. The protagonists are murdered by me My Disciples Are All Villains Kill The Hero Warlock of the Magus World Carefree Path of Dreams Soul of Negary All of these are pretty good
But out of everything the one that seconds revedend knsanity is reincarnation paradise Dont read official translations Read g translate
Dungeon Defense is pretty dark, ruthless cold and cunning The Human Emperor has certain situations like that however the MC isn't alwas ruthless cold and cunning The World After the Fall FFF-trash hero (it's so ruthless and cold to the point of comedy) - KDCS? I liked Star Rank Hunter Dark civilization Otherworldly Evil Monarch Most korean novels have that type of MC or apocalypse novels Solo Leveling, KTH, emperor has returned should be recommended more. There was one webnovel that never got picked for translation about a demon heart that was quite extreme