Per the wiki[valheim.fandom.com], XP will be added for a fraction of each sword or bow hit from a skeleton and if I'm reading the growth formula correctly (good chance I am not) it takes a few more than 5K total hits to reach level 50 (unrested). But again it does seem to be worth it. The skeleton archers are pretty deadly in ML at level 33. Confess that we did get a LOT of help from a pair of dvergr mages with their rogues against a soldier and a gjall. Curious if I could use the protection bubble to protect a friendly rogue?