My game has stronger medicinal herbs. They grant a +4 instead of +2 to the relevant throws to cure disease, neutralize poison, or cure light/serious wounds. Their use allows characters with only one rank of Healing to make those throws at an 18+ (after the bonus) instead of not being able to do them at all.
I quite like this rule.
I've replaced level loss from energy drain with the following: if you would lose one level, instead age 2d6 years and save vs death at +4. If you would lose two levels, instead age 2d12 years and save vs death. Catastrophic energy drain ages you 2d20 years, causes a mortal wound, and requires a save vs death at -4.
Cool rule.
Divine spellcasters have limited spell repertoires like arcane spellcasters (spells per day plus Int mod), but gain Ceremonial Casting as a bonus proficiency with a separate (much larger) repertoire.
Interesting. That might make a good Axioms article.