Heck I've already put dragons in with steel properties for their bones because I love the whole "here's a reason and reward for hunting down these beasts" concept so much. Think I'm gonna add in an iron-equivalent for the other megabeasts and perhaps bronze level for the semi-megas. Still gotta find something better to do with the bronze colossus though.
I also took the balm framework and expanded it to:
*balm of strength, semi-mega hearts, gives title giant slayer, general buffs to attributes and speed plus some helpful [NO_etc] tags
*balm of wisdom, hydra heart (couldn't think of where else to go but hydras tend to be great for skilling up), gives title hydra slayer, buffs mental attributes, adds a skill roll success boost and some of the [NO_etc] tags
*balm of speed, roc heart, gives title roc slayer, buffs speed, agi, and endurance as well as the usual tags
*balm of might, dragon heart, gives title dragon slayer, buffs strength and toughness along with the usual tags
*balm of power, made from all of the previous balms, gives title megabeast slayer (though perhaps something like legendary hero would make sense?), gives a stack of the same buffs as the components and a couple of additional tags
Still trying to find the right balance for the different components, though they do stack with no actual upper limit, but it's pretty cool going around and collecting all of these components to produce a superbuff, and gives a reason to do something besides go hunt for a roc you can sneak up on to get an easy balm of power.
Steel-equivalent dragon bone, btw, makes dragons terrifying, spending too long in close quarters with the bastards isn't fun, I've had the best success from sneaking up and slashing the throat then running and praying they bleed out before they catch me... at least until fully buffed, but even then it still takes a bit of work usually unless I get a lucky hammer strike to the brain.