Experienced players already love Chaos mode, and if you're thinking of diving in, well, it's a very different experience. Chaos mode is how the game was meant to be played. Just because you can summon a monster doesn't mean it will happen. Just because an attack did high damage previously, doesn't mean it will this time. Chaos adds a random element to a lot of the game's mechanics, and while the randomness of summons can be offset by pick ups, there is never a guarantee.