Exactly! Some foes are too dangerous for you to tackle.
I really love the idea though. Maybe it could be a mechanic that is "unlocked" or gifted by the elves in the form of a special item. Or a team ability that is unlocked when a party shares a lot of adventures together. The same way that Samwise was able (against all odds) to defeat Shelob in order to protect Frodo. Really love the Voltron parallel (MMPR fan as growing up). As you said, it's tricky to thread the needle but the idea is really good an it deserves to be considered more.