has a dnd class im building
15 years ago
General
it uses the Gems you get from treasure or what ever as its components for spell casting. like ruby would be used to cast a fire spell dependin gon the quality gives damage rank and caster level means number of dice type thing. but its main weapon is a beam of light an emit at will with out the gem lens that they can build it just blinds for 1 round. but if place it through a ruby lense it gains 1d4 to 1d6 fire damage. so on.
FA+

would be a nice thing to add to my dwarf rune mage