GrenadeSalad

Then he needs to seriously uptune combat for that party. If combat is rare, it should always be impactful.

It makes a sorta-caster able to pretend to be an archer, more or less. It's great, but it's no more horrifying than a fighter with a bow of some kind.

Find Steed needs some polishing, but I have to push back on the 'don't write rules that mean anything' position. Content that gives no guidance on how things are supposed to work is a stone nightmare when edge cases and interactions come up. This is just a bad first draft, not a bad idea, and half of what makes it bad is that it references and doesn't update the mounted combat stub.

An adventure for levels 3-10 and 17.

This right there? This is why nobody plays high-level games.

My group uses this, but with a separate temporary exhaustion (we call it Trauma) that goes away on a short rest. Still handily serves the purpose of discouraging yoyoing without being too punitive.