Shangri-La Frontier Season 1 Episode 12 Regrets Always Lie in the Past ( Air Date 2023-12-17 ) Genre Animation, Action & Adventure, Comedy, Sci-Fi & Fantasy category. Overview "Pencilgon sends Sunraku and Oikatzo to the Iron Ruins of the Divinity to grind their levels to at least level 50. While there they encounter the Lifestide Lake Serpent monster.".