An ability unique to Usui Sadamitsu based on his discovery of Gomuso-no-yu, which is said to be where the town of Shima Onsen was first founded. Legend says that when Minamoto-no-Raikou and her Four Heavenly Kings stopped in Gunma Prefecture, Sadamitsu was led to a hot spring by a child claiming to be the mountain's god, which he did in order to reward the warrior's fervent practice of sutras. After resting in the spring's waters, which were said to be potent enough to cure 40,000 illnesses, he christened the spring Gumuso-no-yu and enshrined the
Yakushi NyoraiBhaisajyaguru, or the Medicine Buddha. Worship of him in Japan began soon after Buddhism was introduced to the country.
within its halls. The entirety of Shima Onsen would later be opened by by
Sanada NobuyukiSanada Yukimira's older brother.
, who bathed in its waters for the sake of longevity.
It should be noted that the founding of Gomuso-no-yu is not the only instance of Usui Sadamitsu being linked to the healing arts. After all, his mother was a priestess of the Buddhist Arhat
Pindola BharadvajaMore commonly known as Binzuru in Japan, he was one of the four Arhats tasked by Gautama Buddha to remain in the mortal world.
, who presides over the health of children and possessed the gift of healing. Due to this connection, Sadamitsu can summon a portion of the spring's healing waters to aid him, no matter how far he is from Shima Onsen.
...Because this Skill primarily involves water, though, it's quite handily countered by a certain other member of the
Four Heavenly KingsWatanabe-no-Tsuna's Varuna/Suiten's Disciple Skill allows him to protect himself against water-based attacks. This weakness ended up being Sadamitsu's downfall during Heian-Kyō's Imperial Holy Grail War.
.