Are there rules for being crushed by weight?

[SangoProduction]

So, I saw a talent in Spheres of Power, under Nature, called Sandstone. Apparently a level 8 caster can create up to 2 tons of stone to encase someone. Then, immediately, I thought "What if I made the encasement right on top of them instead?"

So...I came here to see if there are any rules around crushing people with immense weight.

[unseenmage]

Cave ins and Collapses (https://www.archivesofnethys.com/Rules.aspx?Name=Cave-Ins%20and%20Collapses%20(CR%208)&Category=Dungeon%20Terrain) might be what you need, or at least provide some guidance.