Nilkanth Temple sits west of the main monument groups in a ravine setting that feels more secluded than the central ruins. The shrine is dedicated to Shiva, but the architecture around it carries the mixed courtly vocabulary of Mandu's later history.
It is worth the detour if you have transport and time after the main groups. The approach, the water, and the stonework make it feel less like a checklist monument and more like a place still in local use.