Nature magic increases maxage by 50% of base maxage per point, so N1 turns a regular human from having maxage 50 to maxage 75, a 50% increase. N2 would make that 100.
Oh yea! That makes more sense. 25 years for a human, not 25 percent. After some tests it would seem that fire magic only give -4% max age so that was also wrong. Wonder were I picked up those notions? From a N2 mage that was given a thistle mace?
Growth three with pythium prevents loss of most of your theurgs and arch theurgs. Those that did get diseased got a shroud of the saint ('cause of the regeneration on the bless). (I don't feel growth three is worth it for this reason alone however- i would rather just hand out regen equipment or send them into battle against barbs or whatever with a regen bless every few turns)
I can confirm what Corinthian said about bakemono sorcerers with their death magic (even when they have fire 2 or three i don't see them dying too much even in a death 3 domain)