Meldstone

You grant the targets the ability to merge with and move through solid stone, whether natural or worked. They can enter stone surfaces and move through them at half their normal speed. While merged, a creature cannot be targeted by direct single-target attacks or spells, but it can be affected by area effects that impact the stone (such effects deal half damage to merged creatures unless they explicitly affect objects). Merged creatures cannot act, hear only muffled sounds from outside, and must hold their breath while within the stone. A creature cannot end its turn inside another creature or object. Most spellcasters use this ability to slip through castle walls, cavern passages, and fortress stone alike - often as a means to hide or escape unseen.

9th level: Targets can see and hear normally while merged with stone and no longer need to hold their breath, though they still cannot act.

If the spell ends while a target is within stone, they are harmlessly expelled to the nearest unoc- cupied exterior surface adjacent to the stone. If no such space exists within 30 feet, the target appears atop the stone at the nearest safe surface and takes 1d6 bludgeoning damage per 10 feet moved. This spell allows movement through both natural and worked stone, but not through metal, crystal, or magically warded barriers. It has no effect on soil, sand, or other loose earth materi- als. Targets may bring all gear and clothing that is a part of them, including living creatures if they hold its hand, tail, arm, etc. (so though only "4" creatures targeted, holding hands could carry the number much higher). Targets can hold their breath for 20 + CON modifier rounds while merged (about 2 minutes); afterward they begin to suffocate (1 HP per round). Examples of valid materials: Granite, limestone, basalt, marble, sandstone and other non-loose formations.