I think that quantum pillars/towers should create 1 random, like nymph tears. The reason is that there are already quanta-generation skills programmed into the game (air for damselfly, fire for upped firefly and brimstone, light for RoL and unupped firefly, earth for gemstone, etc.) but no skill that would fit "generate 3 random types of quanta"
Actually, on further thought, do all pillars/towers have the quanta generation as an ability?