Runestones are physics objects that cause certain effects when activated by the player. They can be found naturally in the world on small pedestals. Kicking a runestone will activate it, indicated by circles of magic particles emanating from it. Kicking it again deactivates it. The effects vary, but usually include modifying projectiles that pass through its area of effect. This affects enemy projectiles too, when applicable.
The "Runestone of Edges" is much more common, due to an unknown error in the code.
|Icon||Runestone's Name||Effect||Activated by Throwing|
|Runestone of Emptiness||Projectiles in a short radius disappear.||Yes|
|Runestone of Fire||Projectiles are turned into Fireballs.||No|
|Runestone of Light||Projectiles are turned into Concentrated Light.||Yes|
|Runestone of Magma||Certain liquids spontaneously convert to Lava.
Liquids may react with the lava they're converted into.
|Runestone of Weight||Projectiles travel slower.||Yes|
|Runestone of Edges||Projectiles are turned into Disc Projectiles.||Yes|
|Runestone of Metal||Metals are turned into Poison.||No|
Runestones can also be thrown and used for accidental kills in a similar manner as Emerald Tablets.