You can create new spells with ease, to have reached the level of Archmage is to make an impact on the future of Magic. You are able to pick or design a branch of magic to excel in. You will be able to recreate any magic made using your branch of magic upon witnessing it. You no longer have a cooldown between the creation of most spells, the strongest spells will still require time between each trial but it is negligible. Every once in a while you are guaranteed to have a bout of Insight that will never leave you disappointed, this Insight could be something as small as a spell that would connect well with your current repertoire or something grand, a sliver of truth of the fundamental rules of Magic. The bonuses feat previously provided that increased the amount of mana produced by you have been improved dramatically, allowing for even multiplicative boosts in the future. Creating entirely new branches of magic could give you a multiplier based on how important the new branch will be for the future of magic.