Use the following entries with the ec.addobjecttoinventory code.

ep_leather
ep_steel
ep_fabric
ep_chainmail
ep_wood
ep_metal
ep_fire
ep_necro
ep_wind
ep_earth
ep_water

To add damage crystals, use the following code: ec.addobjecttoinventory art_add_damage_<level 01-07>(#edamage<fire, cold, poison, spirit, electric>) <number>