If you're burrowing and have precise tremorsense, can you be said to have line of sight to anyone touching the ground? Line of effect?
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It seems you would have line of "sight" (w/o actually having a visual image of the target of course), though not line of effect unless the effect explicitly goes through the intervening materials. Not sure line of sight means anything w/o line of effect.
What player-available option gives precise tremorsense?
I imagine RD is asking this for the sake of having NPC monsters burrowing underground and making attacks from a position where they cannot be attacked back.
Line of effect in PF2 doesn’t play well with opposing factions inhabiting different material mediums between them. Burrowing creatures are technically in a hole, inside the earth, so the ground is the same kind of barrier that a wall of stone would be. If a wall of stone stops line of effect, then being withdrawn below the surface of that stone does as well.
There are awkward cases that complicate this: Glass, Water, etc, and the physics of it all are not going to resolve well between the science of real world material interactions and magical game mechanics.
As a GM, you try to decide what is fun. Generally, exploiting game mechanics that are nebulously defined in ways players cannot possibly replicate is going to lead to very frustrated players. Enemies that can harm PCs without anyway of being counter attacked often fall into this category.
What player-available option gives precise tremorsense?
Earth kineticist.