Why can't you parry them? You have lvl 3 Black Metal Shield, yes? I take it your Block skill is also not ZERO...

Your parry is also based on your max HP. Are you sure to use 2 HP foods of good quality? With 2 quality HP foods you can parry even 2 star seekers.

Going into Mistlands for first time you should have Bread/Lox Pie/Fish Wraps as your go-to foods.

EDIT: Also, you are using a WISP LIGHT, yeah? https://valheim.fandom.com/wiki/Wisplight