A dark matter line search using 3D modeling of Cherenkov showers below 10 TeV with VERITAS Dark matter DM has not yet been directly observed but it has a very solid theoretical basis. There are observations that provide indirect evidence like galactic rotation curves that show that the galaxies are rotating too fast to keep their constituent parts and galaxy clusters that bends the light coming from behind lying galaxies more than expected with respect to the mass that can be calculated from what can be visibly seen. These observations among many others can be explained with theories that include DM. The missing piece is to detect something that can exclusively be explained by DM. Direct observation in a particle accelerator is one way and indirect detection using telescopes is another. This thesis is focused on the latter method. The Very Energetic Radiation Imaging Telescope Array System V ERITAS is a telescope array that detects Cherenkov radiation. Theory predicts that DM particles annihilate into e.g. a γγ pair and create a distinctive energy spectrum when detected by such telescopes e.i. a…