Used to spawn monsters for Voidwatch Ops.
Planar Rifts also serve some of the same purposes as Atmacite Refiners: they can be used to infuse atmacites, purge equipped atmacites, and enrich (upgrade) atmacites using cruor.
Finally, Planar Rifts accept the trading of Ascent Items which raise spectral alignment levels for the next successfully completed battle.
Three Planar Rifts may be found in each zone which has a Voidwatch battle. See the specific monster pages for the positions of the Planar Rifts. Note that the Planar Rift inside Provenance functions only as a zone exit; the Regal Pawprints can be used to upgrade atmacites and change equipped atmacites.