Worlds, characters, items, spells, powers, classes, races and house rules, made by players and shared with everyone. Put any of it on the table in your game and the GM plays with it.
A house rule for any system: a failed roll never means "nothing happens".
1st-level evocation: a mote of light that clings to a creature and cannot be hidden.
Salt-marsh stilt villages, smugglers, and sea-gods nobody admits to praying to.
A grey cloak that drinks light.
A pale, eyeless dog that hunts light.
A city under a sunless sky, where light is currency and the dark belongs to the Moths.
A tiny d6 system: three Lights, sparks on 5-6, Oil to push your luck, Wick to stay alive.
Creates a sphere of light from the size of a golf ball to that of a basketball