Boss
How to beat The Warrior
Roof of the Tower
The Warrior is Joan's first battle, on the Roof of the Tower. Listed health is 1,800 and experience is 600. Erica Lindbeck voices her. She sets fire walls, uses a three-hit string, a slide thrust, and fireball pillars. After she shouts 'The Flames will take you!' a pillar forms where she lands. At half health her weapon catches fire.
Rewards are Infernal Pyre, Holy Light, the Burnt Sword of Fierbois, and The Warrior's Key. Holy Light passes Chaos Shards and can deflect projectiles.
Not the Courage fight
Notre-Dame hosts a second Joan fight, Courage of Gabriel, at 11,431 health. That one grants the Courage virtue and does not drop another card. Patterns for the rematch are thinner in the sources, so they are flagged on the Joan page instead of copied here as if they were the same script.
What I ran into
I wrote one Joan page first and it answered neither search. People looking up The Warrior want the roof. People looking up Joan of Arc often want the virtue. Splitting them took one reread of the health table.
Questions
Where is The Warrior?
Roof of the Prison Tower, in the Paris streets.
What do you get?
Infernal Pyre, Holy Light, the Burnt Sword of Fierbois, and The Warrior's Key.