Elden Ring: Shadow of the Erdtree has a new levelling system to help you take on all the seriously strong bosses in the DLC: Scadutree Fragments (which are apparently pronounced Shadowtree Fragments). The only catch is that, along your journey to get these new fragments, you'll have to go up against some tough opponents.
Unless you're this player who posted a map to Reddit: "You can get Scadutree Blessing level 12 without killing any bosses."
