1) Acquire the following: Holy Water, "Binding Object", Holy Symbol, Favorite Thing
2) Ascertain the demon's True Name by any means necessary.
3) Defeat the demon in battle, liberally using holy water and holy symbol as necessary.
4) Upon defeating them, cover them in any remaining holy water.
5) Crush Favorite Thing and sprinkle over demon's chest.
6) Awaken a Spark of Goodness in demon's soul.
7) Drive holy symbol through demon's chest.
8) Holding the Binding Object aloft, chant the demon's True Name seven times.