As requested by Scott: a post about consumables to boost your beast stats.
Starting with the two I already mentioned in the chat.
Increases the HP and resistance.
Increases a beast speed.
Brain of the sorcerer
Increase spell mastery* and/or intelligence.
*For beasts that have spells
Essence of nails
Gives the 'Though' ability.
Eye of the Beholder
Increase the beasts accuracy.
Feet of the rat
Gives the 'Dodge' ability
Gland of the spider
Gives 'Immune to Poison' ability.
As by his request please add your own.