SRD 5.2.1 · Senses
A creature pinpoints a nearby enemy through Tremorsense while both touch the same floor. Another ability requires a target it can see. Does Tremorsense alone satisfy that requirement?
No; the sense does not count as sight.
Tremorsense can supply the location under the stated surface and range conditions, but its rule explicitly says it is not a form of sight. A separate ability requiring a visible target needs an actual way to see that target. Keep location information useful without granting permissions the sense lacks.
A flying target that does not contact the shared surface or liquid cannot be detected with Tremorsense merely because it is nearby. Range alone is insufficient.
Is there a shared contact surface, and does the intended action require sight rather than location?
A creature with Tremorsense can pinpoint the location of creatures and moving objects within a specific range, provided that the creature with Tremorsense and anything it is detecting are both in contact with the same surface (such as the ground, a wall, or a ceiling) or the same liquid. Tremorsense can’t detect creatures or objects in the air, and it doesn’t count as a form of sight.
Source: SRD 5.2.1, 190. Online guide.
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