We are prelates of the lord, scum. We are not here to bend aught, we are come to cleanse!
Father Grissom (グリッソム, Gurissomu?) is a key commander of the Order of the Crimson Blades under Romeo Guildenstern in Vagrant Story. He is a warrior-cleric, and despises the Müllenkamp cult. His brother, Father Duane, is also a member of the Crimson Blades that goes off to Leá Monde.
Grissom's brother is killed very early in the game, fueling a desire for revenge in his heart. He leads two soldiers, Faendos and Lamkin, after Duane's killer, the Riskbreaker Ashley Riot. During the pursuit they wind up at the entrance to the Snowfly Forest, where Ashley has run off into. At the entrance is Jan Rosencrantz, a tricky man whom Grissom is not fond of. Though Rosencrantz promises Grissom that he would not survive the trip into the Forest, Grissom ignores him and goes for revenge.
Early on, he loses both of his companions in a quake, but presses onward to run into the Müllenkamp leader, Sydney Losstarot. Determined to kill his enemy, Grissom attempts to use Dark powers to summon a monster. Sydney warns the Crimson Blade that he would not survive the summon, but is ignored. Grissom seems to fail, much to Sydney's amusement. Ashley then appears to confront Sydney, who is gleefully making fun of his foe's folly. Then Grissom regains consciousness and succeeds in summoning a monster. Both Sydney and Ashley, though enemies, join forces to defeat Grissom and his creature. Afterward, Grissom dies.
Through his use of the Dark, Grissom returns to life as an undead monster in front of his allies, Lady Neesa and Sir Tieger. He struggles with controlling his zombie body, and begins to hear voices from the walls of Leá Monde. They tell him that his friends are plotting to kill him, and convince him to attack them. Grissom, now completely crazed, charges at Neesa and Tieger. In the end, Tieger holds Grissom back while Neesa escapes. Leá Monde collapses around Grissom and Tieger, making a tomb for them both.