The remarkable crystallographic plastic anisotropy, tension-compression asymmetry and strong texture effects are often referred to as origins of damage intolerance in low symmetry, hexagonal close-packed (HCP) materials. In magnesium, while post-mortem experimental evidence indicates ductile processes at play the role of anisotropic slip and twinning mechanisms on the rates and states of damage accumulation remains elusive. We present a micromechanical investigation of intragranular ductile damage by void growth and coalescence in Mg under triaxial stress states. Using a finite deformation HCP crystal plasticity framework within three-dimensional finite element calculations, we investigate crystallographic aspects of anisotropic void growth that emerge from rich interactions with slip and twinning mechanisms in magnesium, leading to potentially complex coalescence characteristics. This ongoing research serves as a step towards developing a crystallographically informed theory of anisotropic continuum damage mechanics for the predictive ductile failure modeling of advanced materials.