You sense the presence of any trap within range that is within line of sight. A trap, for the purpose of this spell, includes anything that would inflict a sudden or unexpected effect you consider harmful or undesirable, which was specifically intended as such by its creator. Thus, the spell would sense an area affected by the alarm spell, a glyph of warding, or a mechanical pit trap, but it would not reveal a natural weakness in the floor, an unstable ceiling, or a hidden sinkhole.
If you sense a trap in this way, you can use your action to see a faint aura around any object or area that is trapped, and you learn its school of magic, if any.
The trap is not detected if the trapped object or area is not in line of sight. Any physical barrier will prevent the detection, unless the barrier is part of the trap, EX. an illusion of a floor over a pit trap, or a lid over a pit trap.
* - (a monocle or similar eyewear worth at least 300 GP. The caster must actively look through the eyewear to detect the trap.)
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