1.) You're all thinking that the colours or pictures mean something. How about this... Let's assume for a moment that this jackass is the sort to screw with people's minds. Wouldn't it be kind of up his alley to tie you up, thinking of which answer is correct... when the answer is a lie? Quite simply put... There very well could be no answer. It could come down to simply being a matter of having to decide who to throw their life on the chance that at the end of the day, someone is gonna die diffusing this thing so it DOESNT kill EVERYONE.

2. We're also assuming that the riddle is connected just to the pretty orbs. There could be a chance that the riddle involves external sources. IE) Rule of 3s in LoR... Slave, regular, noble. Hells, mortal, Heavens. Oceans (deep), Land, Skies (above), Demon, mortal, Angel.

Just throwing this out there.

Oh, and more likely than not, you guys are overcomplicating things with the colour schemes and scientific facts. We're in medieval times, boobs, and if Brovo was going to make colours so important, I'd have to strike him upside the head because of how many colour blind individuals we've had in the past.