the game has a distinct lunar cycle. its pretty cool. the mundus stones come from the stars? i forgot the craglorn lore, it was years ago. the nirn tore and they fell from the sky? perhaps if there are x moon phases and x number of mundus stones, each specific phase might buff its respective stone by, say, 10%? also, it would be neat, if you could tie in ww's and vamps. so like lets say during the double full moon (which already occurs), ww's get some sort of meaningful, but not terribly overpowered buff, say 12% ? which would be nerfed to 6% in pvp because of battlespirit? and then maybe during a moonless cycle give vampires the same buff.
perhaps even try to line up shadow mundus with the moonless cycle for the vampires to make it more special when it happens, and perhaps idk forgive me, idk what ww's run, but maybe like the thief or warrior or lover or whichever during the full moon so it lines up with ww.
since we are throwing away all semblance of balance with subclassing i dont see this being a problem.
also i think a lich skill line, similar to vamp/ww might be neat.
also bring back clouding swarm on vamp, that was sick.