Kinich

In his best teams on Burning or Burgeon, Kinich uses Obsidian Codex as his best build for the massive CRIT Rate bonus every time he uses Nightsoul Points during his Elemental Skill. It also allows him to build CRIT easier building, letting him sit comfortably at +40% CRIT Rate alone. An alternative to this is 4-pc. Unfinished Reverie for the 50% DMG increase only against Burning opponents, and Kinich will usually be running in teams that utilize Burn anyway, making this a solid option.