Olrox17
Hero
If I remember right, that's exactly what the WotC poster (that might be Minigiant with a different username) was suggesting way back.The trick would be to avoid the combat benefits from ever being specific to the creature type, yet obviously useful against that creature.
For instance, Favored enemy: Dragon would be something like this:
- Immunity to the frightened condition
- Advantage on Dex saves against area effects
Clearly amazing stuff against dragons, but generally useful as well.