Two-star Skeletons can definitely be a problem, especially if you were unlucky enough to have one in your first attempted dungeon. You can parry 27 damage with a maxed Wood Shield, which would likely counter a Skeleton Archer if you have enough health and full leather. Melee Skeletons deal more damage, however, so I'm not sure if you'd be able to parry with a wood shield. At that point, you'd have to resort to either dodges or some campfire shenanigans.