Hourai Sapling (Ground Moon)

A Spell Card of Reisen Udongein Inaba, who has almost reached the end (a Touhou LW original). She utilizes a pharmaceutical theory devised by Eirin in this attack. Eirin is a genius pharmacologist, but her knowledge expands well beyond the realm of pharmacology. In a way, ruling over a nation's people is the same as administering medical care to them, and so Eirin is capable of giving advice to Tsukuyomi about the administration of the Lunar Capital.

Doctors like Eirin are able to make fast and accurate decisions when lives are on the line. This came into play when Eirin went down to Earth to escort Kaguya back to the Moon and when Toyohime was struggling to decide what to do with Mizue no Uranoshimako. The name Eirin gave to Reisen is Udongein.