A Yo-kai Keystone (Japanese: 妖怪アーク Yōkai Āku) is a small, key-shaped item used to summon Yo-kai from the Yo-kai Watch Elda. They first debuted in M04 and the Shadowside anime, and would later appear in Yo-kai Watch 4 and Yo-kai Watch!.
They are said to be the successor of Yo-kai Medals, with some of them featuring Lightside and Shadowside Yo-kai on both sides, while several Yo-kai either have nothing at the back or a Onechanside. Rare variants with different colors also exist.
Just like with Medals, Yo-kai Keystones have been made into real life collectable merchandise. The levels of rarity that range from common, to extremely rare, are Normal, Rare, Extreme Rare, Super Extreme Rare, and Ultimate Rare. Most of the Normal Keystones have a clear color and a regular holo foil, while Rare Keystones have a clear color and a glittering holo foil, and Extreme Rare Keystones have the colors of their tribes, as well as glittering holo foil. There are also Shining Keystones that are equal to Super Extreme Rare ones, and Gold Keystones that are equal to Extreme Rare ones.
There are 330 Keystones in total.
Yo-kai Keystones represent the feelings that connect Yo-kai and humans. Just like Yo-kai Medals, they are given to select people once they fulfill a specific Yo-kai's needs.
Yo-kai can be summoned via the Yo-kai Watch Elder by putting the Keystone into the keyhole, and saying the summoning chant while the Yo-kai appears in sight.
It was originally thought that the Keystones were successors to the medals, but due to their inclusion in Forever Friends and Yo-kai Watch!, they existed in the past and present as well. However, in Yo-kai Watch 4, Nate's Yo-kai Medals turn into Keystones after he visits the future world, probably due to the effects from the future.
Types of Keystones
Shadowside Keystones are ones that apply to Lightside and Shadowside Yo-kai, with both of the sides representing the Lightside and Shadowside form. They appear regularly throughout Yo-kai Watch Shadowside, and in the future world of Yo-kai Watch 4.
Merchandise-wise, several Keystones have different variants of existing Yo-kai, such as Junior's Shadowside form taking the form of Blizzard Wolf rather than Burning Dragon, and Nekomata's Shadowside Gold Keystone being of an unidentified entity.
Godside Keystones function just like Shadowside ones, except they have a third form which is considered to be stronger than their Shadowside. They were first featured in M05, where Yo-kai like Nekomata, Zashiki-warashi, and Kappa are given forms after they were summoned with the Yo-kai Watch Elda God.
A few of those Keystones appeared in two of the Yo-kai Keystone Zero series sets, which are colored white instead of light-blue. Though, Yo-kai like Yamambaa and Suu-san have differently-shaped Keystones.
Onechanside Keystones are used for regular Yo-kai that have appeared in the original games and anime, and serve as a replacement for Yo-kai Medals. They are used prominently in the Yo-kai Watch! series, where Nate uses them to summon them in the same vein as he usually does.
Regular Keystones at the back have a background, with the silhouette of the Yo-kai present. While several Yo-kai now has a "Onechanside", which allows it to take on a different form that could drastically change any outcome.
- Main article: List of Yo-kai Keystone Sets (Japanese)
Yo-kai Keystones exist in real life as collectable merchandise, sold in Japan. They are manufactured by Bandai Japan, which have been responsible for manufacturing Yo-kai Medals and other related items. They are released in sets, featuring select Yo-kai. Each box contains 10 random Keystones, making this a blind box, much like with the Yo-kai Medals before.
Each pack comes with one Keystone, which can be used to play the summoning song on the DX Yo-kai Watch Elder toy, or scanned via the Nintendo Switch's NFC reader in the Yo-kai Watch games. Depending on the Keystone, it usually gives the player several items, or special Key Items which allow the player to fight exclusive Yo-kai.
There are several separate Keystone packs, that sometimes feature Goku Yo-kai like Rinne and Goku Fubuki-hime together, with the former having a unique Keystone design that stand out from the regularly released sets.
For Yo-kai Keystones to be scanned into the PlayStation 4 version of Yo-kai Watch 4++, an application is required to download it as the console doesn't have a NFC chip reader.
List of Yo-kai Keystones
- In early portrayals of the Keystones, including their debut in the 4th movie, they had the insignia of the old Yo-kai tribes. These were later replaced by the symbols of the Shadowside tribes.
- For Yo-kai Watch!, most of the original Yo-kai that also appeared in Shadowside still retain their Shadowside Tribes in the new series.
- The only Shadowside Yo-kai that don't have real life Keystones so far is Mitsumata Mizuchi.
- Several Onechanside Yo-kai don't have Keystones so far, they are Mochismo, Jabow, Reuknight, Corptain, Master Nyada, Mirapo, Robonyan F (Who only has a Miracle Keystone), Wiglin, Steppa, Rhyth, Melonyan (Who also only has a Miracle Keystone), Sighborg Y, Dazzabel, Petty-Cake, Koma Kaachan (She only appears as Komasan's Onechanside), Goofball, Wotchagot, Pride Shrimp, Grubsnitch, Poofessor, Thornyan, Faysoff, Demandi, Toiletta, Ballin, Snailspace, Chippa, Rhinormous and Hornaplenty.
- Uula, Gashadokuro (Shadowside), and Onimaro Leader don't have any either though they may be anime exclusive, although, unconfirmed.
- Oniou Rasen and Kaodeka Oni don't either but Oniou Rasen may be because he's a Boss Yo-kai and Kaodeka Oni are simply just humans inspirited by Onimaro who also don't have Keystones (Not counting Ogu, Togu & Mogu) possibly due to them being minions.
In other languages
|Japanese||妖怪アーク Yōkai Āku|