No equipment in the game can survive contact with a two star fuling. Valheim damage is both raw power AND armor penetration, so the absolutely insane 100% attack boost ends up dealing more than three times the damage. Be afraid. Be VERY afraid of 2 star fulings.

Bonemass power is your friend. It reduces enemy attack power in half, which once again double dips with armor to reduce damage by far more than half. A bonemass 2 star fuling is suddenly as scary as 0 star fulings, and anything less than that is trivial to roll over. It's the main reason to keep bonemass as your primary skill forever.

Fulings have a particular weakness to ice arrows. The freezing effect slows them down, and helps split up enemy packs to become easy targets.