Intangible. Holograms are immune to any damage type except for electricity and ion. They cannot be affected by any physical attack, and they cannot physically interact with real objects.
Free movement. Holograms can move freely across all terrains and difficult terrains, and are unaffected by environmental features. However, they are unable to pass through solid objects and walls.
Immortal. A hologram cannot be killed in the normal way. If reduced to 0 HEALTH, the hologram deactivates, but it remains at 0 HEALTH and recovers it at the normal daily rate. The only way to permanently destroy a hologram is to destroy its CPU, which is located in a computer elsewhere.