Well, some general things some reavers might do is:
- Apply their +20% miss chance after a different wound effect, so you are stuck with it
- Untrait fire damage, apply their -armour rating, for medium and light armours its pretty bad unless you stack physical mitigation. This can bring your mits to something like 20-30%.
- They'll apply their dots then impale, so you might find yourself from 5k morale to 0 in a very short time


In my opinion classes that match up to reavers well are spear wardens that don't heal/trait shield.

Things that i keep in mind when fighting reavers is trying to pot their miss chance debuff and good movement, keybind your skills and mouse turn.

Hope this will help.