木皮: tree bark / 黙秘: remaining silent

黙秘: remain silent

秘伝: confidential, secret tradition

飛竜: a wyvern / 飛龍: a "flying dragon" (shogi piece)

篳篥: a cylindrical double reed wind instrument used in the gagaku music of Japan

百日の説法屁一つ: “a hundred days of sermonizing, one fart” → a metaphor for how extreme effort something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds

火の鳥: A phoenix, more specifically as in Western mythology.

記念碑: monument

比重: specific gravity; relative importance

悲寥: