I know you wanted to limit bag of rat tricks for the anti-aging, but the problem isn't the creature types, but the CR of the creature, in general. I'd restrict it to any creature of your CR - 2 or higher. That way using that ability at least might be a challenge sometimes. It also makes an interesting idea that as you get more powerful, it becomes much harder to find creatures to keep you from being old. --[[User:Aarnott|Aarnott]] ([[User talk:Aarnott|talk]]) 22:59, 20 September 2013 (UTC)