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This article is about a/an transformation device in Kamen Rider Black and Kamen Rider Black RX.
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The King Stone (キングストーン Kingu Sutōn) is Kamen Rider Black and Shadow Moon's means of transformation. Embedded upon the center of their belts is the artifacts known respectively as the Stone of the Sun (太陽の石 Taiyō no Seki) and the Stone of the Moon (月の石 Tsuki no Seki).

There are two King Stones, one for each Century King. When Kotaro and Nobuhiko were both kidnapped, they were each infused with one of the King Stones. However, Kotaro escapes becoming a Century King thanks to the intervention of his stepfather, Soichiro, and takes up the identity of Kamen Rider BLACK. Nobuhiko is not so lucky, however, and becomes the perfect Century King; Shadow Moon.

In order to transform into Black, Kotaro crouches down, cracking his knuckles. He then crosses his arms individually into the air, before circling them into a pose. He then shouts "Henshin!" causing the belt to materialize itself in several red & white flashes. His Rider form then materializes in a shade of green, and the BLACK logo etches itself into his armor to complete the transformation and refine the armor's features. The King Stone is also the energy source for BLACK's finishing moves, the Rider Punch, Rider Kick, and his unique King Stone Flash technique.

Since both existing King Stone had same functions, it also gave the bearer the equal ability as the second bearer (e.g. control over Battle Hopper, summoning weapons like the Satan Sabre).

In Kamen Rider Black RX, Kotaro's King Stone was split in half in response to BLACK's evolution and became the Sunriser (サンライザー Sanraisā). The Sunriser is BLACK RX's transformation belt. In response to BLACK's evolution, Sunriser enables Kotaro to communicate telepathically and use sunlight to power RX up. That factor places RX at a disadvantage while in an area devoid of sunlight. The Sunriser also allows for Form Change, changing its design to suit the form, as well as providing RX with versatility.

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