Quartz
Hero
Can you add character levels - Warrior, Fighter, Rogue, or Barbarian rather than spellcasting classes - to trained animals? It seems to me that it would make more sense to give (for example) an animal like a warhorse fighter levels than advance it in HD, which might involve increasing its size. Or a Stirge might gain levels in Rogue, translating Sneak Attack for better blood drain. A wolverine or shark might gain levels in Barbarian. After all, you can't have your 20th level fighter charging even a modest dragon on a 4HD horse, can you? The horse would die from the merest whiff of the dragon's breath. But if the horse had 10 levels of fighter, a decent CON, and suitably enchanted barding, then it might just survive.
This also allows for plot hooks such as the young blade going to the retired knight seeking his famous horse. ("Sir Phillip, only a mount with the experiance of Ernesto could withstand the presence of Flame.") And warhorses were terrificly valuable, so we could see characters paying to have their experienced horses Raised.
This also allows for plot hooks such as the young blade going to the retired knight seeking his famous horse. ("Sir Phillip, only a mount with the experiance of Ernesto could withstand the presence of Flame.") And warhorses were terrificly valuable, so we could see characters paying to have their experienced horses Raised.