Truesight
If you have Truesight, your vision is enhanced within a specified range. Within that range, your vision pierces through the following:
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Invisibility. You see creatures and objects that have the Invisible condition.
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Visual Illusions. Visual illusions appear transparent to you, and you automatically succeed on saving throws against them.
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Transformations. You discern the true form of any creature or object you see that has been transformed by magic.
Ethereal Plane. You see into the Ethereal Plane.
Source · SRD 5.2.1 · page 190