When you arrive at the Ragnarok, you will see these different coloured monsters lurking around in different rooms, known as Propagators. They are easy enough to kill, and there are two of each colour, 8 in total, but you can't just simply kill them one by one, you have to kill them in pairs, for example, the two purple ones, then the two red ones and so on. By doing that, any that you kill will not regenerate. They are also prone to every status effect, including instant death, and it is the only boss battle where Odin can appear. At this time, now that you have Rinoa back again, she has a new limit break called Angel Wing, which has the effect of being berserked except she uses magic.
