Shin no Ishi

The Shin no Ishi (真の石) was a magical stone in the video game Sailor Moon: Another Story which was used to heal Mamoru Chiba after he was injured by the Oppositio Senshi. Similar to the Silver Crystal in the anime, pieces of the stone needed to be found and brought together for the Shin no Ishi to manifest, in this case the Shitennou's respective "Yin" and "Yang" stones.