Master of Berserker of Black during the Great Holy Grail War, Caules is the eldest son of the Forvedge family who was born as a spare successor for the family and as a caretaker to his older sister.

As his sister became the head of the family and approached the highest seat of Yggdmillennia under Darnic after many months, he began to explore other avenues for his life rather than live as a piddling magus who would never accomplish anything. The Holy Grail War interrupted those plans, and while he was originally to travel to Romania as simple backup, the Command Spells began to manifest upon his arrival. With no choice, he was forced to participate as a Master.

After the Great Holy Grail War, he and Althea went to London. Althea is responsible for helping with Caules’ magecraft. He spent his days in shame while being watched by the Mage's Association in London. However, one day, Caules had his class changed with a single phrase by Lord El-Melloi II, who told him, “Why are you studying this kind of magecraft which doesn't suit you? Your talent is much more suited to this, you know?”, and before he realized it, he was surrounded by classmates who were dangerous in terms of both talent and personality while he was still in a daze. Caules would often think: “No way, I want to live a normal and mediocre life. I don’t want to get involved with these people.” While sighing softly as he gave a sidelong glance at Flat Escardos who was making a ruckus in a nearby seat
(Source: Type Moon Wiki)