You might want to be Piers if it's your first run. I did it twice (to get a serpent medal I missed), and ran out on my second run and had to resort to the knife as Chris. It was hilarious beating the final boss with knife slashes though.
Piers gets infinite ammo for this fight.
If you need someone I'll play with you. I have Chris with infinite grenades.
"I expected disappointment. In that regard, I was not disappointed." Official Husband of Gregor of the FE:A boards.