[Thaumatology] Sorcery] Enchantment rules and permanent potions.

[Kalminos]

So the sorcery book was wonderful, especially for the enchantment rules that I've always had missing from games because I didn't like the standard magic system, but I was disappointed where in the box on alchemy-

It said all permanent elixers are made to last one minute instead of permanently and there was no under the hood like there was for armor and shields to allow such enchantments anyway-

I would have liked to be able to have permanent enchantments in general, rather than the 1 fp per hour 'usually on' sort of things- where else do I get my +1 plate cuirasses? As for the potions, what would be a good way to brew a potion to become immortal and not have the unaging go away after 1 minute?

EDIT: Also this is slightly less related, but does the sorcery book also ban creating spells with an FP cost greater than one? It seems like it does but I might be misreading.