Eldritch Invocation
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You have this invocation for 15th Level warlocks.

> **Witch Sight:** You can see the true form of any shapechanger or creature
> concealed by illusion or transmutation magic while the creature is
> within 30 feet of you and within line of sight.

Truesight is an ability some creatures have that allow them to see through magic

> **Truesight:** A creature with truesight can, out to a specific range, see
> in normal and magical darkness, see invisible creatures and objects,
> automatically detect visual illusions and succeed on saving throws
> against them, and perceives the original form of a shapechanger or a
> creature that is transformed by magic. Furthermore, the creature can
> see into the Ethereal Plane.