Keystones (クサビ石), also known as Blackstones (ブラックストーン) to the Shinkansen Ultra Evolution Institute, are a kind of huge crystal formations buried underground in multiple locations throughout japan. The first appears in Episode 02 of Shinkansen Henkei Robo Shinkalion Z.
Description[]
History[]
The Keystones were set up by the ancient Teoti Warriors from while the Teoti still lived on Earth's surface in order to seal away the destruction god, Arabaki, whose rampage on the Earth had caused the planet's environment to become inhabitable for the Teoti, forcing them to migrate to the Yugospia satellite. The twelve Keystones then stood within underground chambers throughout the islands of Japan for thousands of years, until a few members of the Teoti returned with the intent of destroying the Keystones, allowing Arabaki to wipe out humanity and give the Teoti a blank slate for their civilization's return to Earth.
Formation[]
Although the substance of Keystone appeared to be made out of an unknown material unable to be analyzed by SUEI's research apparatuses, it was deducted by former Kitoralsus Agent Genbu after consuming a sample that such unknown material is in fact salt.
Known locations of Keystones[]
| Image | Location | Time Discovered | Time Destroyed | Destroyer |
|---|---|---|---|---|
| Yokokawa, Gunma Prefecture | Episode 02 | Episode 23 | Dark Shinkalion | |
| Morioka, Iwate Prefecture | Episode 04 | Episode 04 | Gorgon All Along | |
| Lake Kagami, Nagano Prefecture | Episode 06 | Episode 06 | Definitely Ungaikyo | |
| Mt. Hōman, Fukuoka Prefecture | Episode 10 | Episode 29 | Deabols | |
| Inuyama, Aichi Prefecture | Episode 12 | Episode 38 | Deabols | |
| Sekigahara, Gifu Prefecture | Episode 13 | Episode 27 | Monsterized Valtom | |
| Mt. Hiei, Kyoto Prefecture | Episode 17 | Episode 38 | Deabol | |
| Ueno, Tokyo | Episode 22 | Prior to Episode 22 | N/A | |
| Ōboke, Tokushima Prefecture | Episode 25 | Episode 38 | Deabol | |
| Tōno, Iwate Prefecture | Episode 26 | Episode 38 | Deabol | |
| Cape Tappi, Aomori Prefecture | Episode 28 | Episode 28 | Monsterized Sougyoku | |
| Sea of Trees, Shizuoka Prefecture | Episode 38 | Episode 38 | Deabol |
Trivia[]
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