Return to the forest hill road where you crossed the bridge and take the right path to face the Bullguard mini-boss. Ensure your Healing Gourd is refilled. The Bullguard wields a giant halberd, performing overhand slams and quick horizontal slashes. His attacks often come in a series of two horizontal slashes followed by a third, stronger overhead strike. After each attack, he pauses, creating an opening for your light combos or a heavy attack. Be wary of his multiple overhead swings culminating in a massive jump attack; dodge all swings before counterattacking.
Once his health is halved, he will parry your next attack, and the Keeper will intervene, locking him in place. You will then acquire your first Spell: Immobilize. This spell binds an enemy for a few seconds, allowing free hits. Stronger enemies like the Bullguard break free faster, and some bosses are immune. Use Immobilize strategically, mindful of its cooldown and magic cost (magic only refills at Shrines). Defeat the Bullguard using your new spell.