The only randomness should be the AI, and I halfway think that should be static. But the other stuff isnt really interesting? Reflect damage etc. If you want to do something basic like that, then do something like "Violence incites the spawn of Void Tendrils to fight against you!" The larger the pull, the more un-targetable Void Tendrils spawn. There is increased damage right there, that isnt just scaling %. Keeps you semi-kiting, too. Simple shit like that would go a long ways to being more interesting.