Suppose that I'm a druid, and I Wildshape into the form of a medium earth elemental (functionally the same as casting Elemental Body II). What senses do I have available to me?
Polymorph spells have a few restrictions:
Each polymorph spell can grant you a number of other benefits, including movement types, resistances, and senses. If the form you choose grants these benefits, or a greater ability of the same type, you gain the listed benefit. If the form grants a lesser ability of the same type, you gain the lesser ability instead. Your base speed changes to match that of the form you assume. If the form grants a swim or burrow speed, you maintain the ability to breathe if you are swimming or burrowing.
While under the effects of a polymorph spell, you lose all extraordinary and supernatural abilities that depend on your original form (such as keen senses, scent, and darkvision).[…] While most of these should be obvious, the GM is the final arbiter of what abilities depend on form and are lost when a new form is assumed. Your new form might restore a number of these abilities if they are possessed by the new form.
Elemental Body explicitly says that shifting into an earth elemental grants:
You also gain darkvision 60 feet and the ability to earth glide.
So:
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I have darkvision out to 60 feet (allowed by Elemental Body).
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I assume I can see normally beyond 60 feet, because I would assume an earth elemental could.
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Do I get tremorsense? Presumably not, because senses are called out in the description of polymorph spells, and Elemental Body does not grant it.
If I don't have tremorsense, how does earth gliding (a variant of burrowing) work?
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If I earth glide for a couple rounds, am I still aware of the locations of other combatants? Particularly if they've moved since I submerged myself?
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If I'm earth gliding, and there's a room in front of me, when do I become aware of it? 100 feet? 60 feet? Five feet? When I pop out of the wall?
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Am I ever aware of room above or below me?
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Am I ever aware of inhabitants of these rooms while still burrowed?
Best Answer
From reading the spell it looks like you don't get tremorsense so you're perception would be limited.
There's nothing to stop you from making perceptions checks though with some limitations. Vision is going to be largely useless except for what's directly in front of you. So with the appropriate knowledge you can determine what kind of rock/dirt/material you're in but other then that you can't determine much. Effectively you're blind with an exception of "I can see whatever my eyes are physically in contact with".
Hearing still works but I'd apply the modifiers for listening through a wall (along standard distance modifiers).
If someone is walking around in a room above/below you could also apply the DC to detect a creature burrowing beneath you.
So in summary, you're only as blind as your perception score makes you!