Van der Waals (vdw) materials with magnetic order have emerged as highly intriguing flatforms for new quantum states. Especially notable is the discovery of Zhang-Rice excitons. Although these states have been shown to exist, the way they propagate within a crystal is entirely unknown, even though this information is important for their role in, for example, novel magneto-optical effects that are currently being explored quite intensely. In this proposal, we will use ultra-high energy resolution Ni L3-edge resonant inelastic x-ray scattering (RIXS) to measure the exciton dispersion in the vdw antiferromagnet NiPS3 and determine a detailed model describing their propagation.