A pyromancy tome from Carthus containing pyromancies crafted for battle.
Give to the old master pyromancer to learn advanced pyromancies of the Great Swamp.
Carthus pyromancies developed in isolation from other forms, explaining their divergent evolution.
Found in the Catacombs of Carthus. From the Abyss Watchers bonfire, cross the bridge, rolling to the left halfway across. You will land on a platform, directly in front of you will be a corpse holding the tome.