Arrow of Echoes

This sleek silver arrow hums with a faintly glowing purple energy.

Echoing Wound. When a creature takes damage from this arrow, the creature begins to emit a magical energy. For 24 hours, the energy leaves an invisible echo of magic wherever the creature has been, which lasts up to 7 days from the moment the energy was created. The Detect Magic spell and other similar magic can detect this trail when within range.

At the end of each hour while affected, the creature must succeed on a DC 15 Constitution saving throw or gain 1 level of Exhaustion, to a maximum of 5 levels of Exhaustion.

Once a creature takes damage from the arrow, it becomes a nonmagical arrow.

Notes: Damage, Detection, Combat, divination