Re: Fantasy HERO encounters & balancing them
It's vague because it's not a cut-and-dry process. Even D&D's "solid mechanic" comes apart if you're not playing like they expect you to play (party of four, including fighter, wizard, cleric, and thief, with magic items). Hero doesn't make that kind of assumption, and it's more wide-open and flexible to boot.
There are many rules of thumb posted in this and other threads on the forums, but none of them are a "solid mechanic"...there is always something weird that will throw it out of kilter.