Overview
Stone Stone (石石) is a hidden rare spirit in Roco Kingdom: World triggered at the Holy Feather Altar magic source on the Old Airship Route. It is one of the two spirits this statue can spawn.
How to Obtain
Teleport to the Holy Feather Altar Magic Source (圣羽祭台魔力之源) in Old Airship Route.
Approach the stone statue.
Throw a ground-type spirit at the statue. Stone Stone spawns around the statue.
Capture with any Gulu Ball.
Tips
Caterpillar uses the same statue with a water-type throw. Bring both a ground and a water spirit to complete both triggers in a single visit.
The throw does not consume the spirit in your party. A low-level ground-type works fine as the trigger.
See Also
Old Airship Route - spawn zone
Caterpillar - sibling statue trigger
Hidden Secrets and Collectibles - full hidden spirit list
Throw Mechanic Details
The throw at the Holy Feather Altar uses the standard overworld spirit-throw command. The thrown Ground-type spirit returns to the party automatically; nothing is consumed and the active party order is unchanged. After the throw lands, Stone Stone walks out from beside the statue.
Pair-Throw Visit
Caterpillar shares the same altar with a Water-type throw. The two triggers are independent, but they need separate throws of the correct element. Carrying both a Ground-type and a Water-type spirit before teleporting in lets a player complete the altar in a single trip rather than returning twice.
Throw order does not matter. Either Ground first or Water first works; the altar resets between throws.
Walk a few steps to the side after each throw so the spawn point is clear. Some terrain edges can clip the spawn animation otherwise.
Both hidden spirits are one-time captures per account.
Combat Role
Stone Stone reads as an Earth-type or Earth-leaning spirit at capture. It fits best as a defensive backup against Fire and Electric matchups in early progression, where its bulk compensates for its modest offensive output. Pair it with a high-speed attacker like Fire Spark for coverage. The full element table is on the Element Types page.