I was thinking , in act1 there's 3 pits , maybe you could change them into an inferno zone ? at the end there's a boss that can drop the mark or black stone with x % chances , that way , we can farm some items , by farming marks ! you can also keep the mark on the act boss aswell , that way we have a choice , cuz right now , it fell really odd , cuz you do 600+runs , for a mark that you may not even get the item you want , witch is okay , cuz D2 is about RNG , but chaining act boss doesnt drop vanilla unique very often