Underground Historic Ruins, and Crystal Demon. (地下遺跡、そして水晶の魔物。 Chika Iseki, soshite Suishō no Mamono.?) is the 23rd chapter of the Web Novel Series and the last chapter of the 3rd Story Arc, Crystal Monster.
- Touya, Elze, Linze, and Yae met and activate the phrase, a cricket phrase, for the first time.
- The phrase has ability to regenerate, to absorb magic, and abnormal hardness but become immobile and fragile when the nucleus is removed.
- Touya showed Duke Alfred the underground ruin ancient writing photograph from his smartphone.
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