To easily gain experience in Chapter 6-4, kill the Evil Butcher, but do not take his key. Press Start, and select the "Reload Last Checkpoint" option to resume at the Quick Time Event where you need to hit The Evil Butcher's helmet. Repeatedly kill the butcher while not taking his key to earn approximately 1,000 experience points each time.
Most of his attacks are blockable. When you move close to him, he will use an attack that is incredibly easy to get a synchronized block on. Simply block the moment you see him attacking and it will most likely be a synchronized block. Then, use the Direct Counterstrike combo while he is dazed and repeat the process. Once your attack is over, he will use the same strike as before, allowing you to block and attack almost indefinitely. This works for both the start of the battle and after you get your magic back. While this does take slightly longer than magic-infused attacks, this is useful if you are trying to finish the trial and want to prevent Pan from healing.
Note: This is a very slow process. When you reach the dead bog level after you ride the horse to get away from the lycanthropes, you'll come to a drop of point where you can't go back in the level after you drop off. You'll enter a Goblin camp where Goblins will respawn infinitely as long as you don't throw two grenades from a goblin that either throws one at you and misses or you grab the Goblin and perform the sequence of knocking the Grenades from the Goblins' hands. It's O.K. to throw one Grenade at the tree, but don't throw two at the tree or the Goblins will stop respawning indefinitely. Continue killing the Goblins for easy experience.You only get 5 experience points from each kill so it will take a while to get all the unlockables.
When you first begin the "Abbey Tower" level, immediately walk out to the left from the corridor you are standing in and look for an old wooden cart against the side of the building. Destroy the cart to find a fallen comrade on the ground underneath the debris, whom has a note attached. Pick up the note to read a reference to his sister Laverne and brother Bernard, and it is signed by "H.", which refers to the other main character known as Hoagie.