ばか！バカ！　馬鹿ー月！

The synopsis mentions the appearance of a new Heretic Goddess -- Artio from Celtic mythology.
"Artos" is also the Celtic word for bear and speculated to be the origin of the name "Arthur."
The identity of the titular "son" should be obvious.

After the deadly duel against Uldin in Ancient Gaul, Godou intends to stop Doni who is leading the Franks but a new Heretic Goddess makes an unexpected appearance -- Artio!?
After its animated adaptation, the long-running series continues to go strong, reaching its 15th volume!!

Through the "corridor" opened by the Campione known as the Queen of Caves, Madame Aisha, Kusanagi Godou the Seventh Campione has traveled to Ancient Gaul. After an intense duel against the local Campione, Uldin, Godou sets off again for a confrontation in order to stop the King of Swords, Doni, who also came from the same era. There, they encountered another Heretic Goddess, Artio. Injured in battle against Doni, the goddess summoned her "son," but the one who manifests is the existence said to exterminate all devil kings... Guiding destiny's path, this encounter will bring about the greatest crisis in the history of the godslayers!

Then, a goddess suddenly appeared. She had a large build and a sharp look in her eyes, scattering haughtiness and dignity like a queen. Her clothes were simple, reminding of underclothes, but she wore a pelt over them.
The pelt was a deep, dark reddish brown, like it was taken off a bear along with its head.
However, she was wearing that dead animal's face on her head like a crown.
Godou was certain. In front of him was a goddess that should be called "Queen of beasts". In the face of a god, a campione's mind and body entered a battle state. For a little while, his body has been overflowing with the power to fight, so her arrival wasn't unexpected.
"To speak the truth, until just now I hesitated," the goddess whispered.
"It's vexing, but there are many godslayers in this world. One of them has wounded me. With this wounded body of mine, it shall be difficult to exact revenge"
The pelt aside, she wore pseudo-underwear, so it was plain to see.
A vertical laceration cut into the goddess's white abdomen. The cut was red-black and obviously painful. It was probably very deep.
"However! Turing that blade against a goddess of earth will not be forgiven. If nobody else, this proud me will never forgive it! That's why I hesitated. Even if the preparations are already made..."
At that point, the goddess gave Godou and the others a glancing look.
She looked at Salvatore Doni, Kusanagi Godou and Madame Aisha in turn and then enchantingly shook her head, finally resignedly muttering:
"But now it's unavoidable. Now that there are two more godslayers, I need to be ready to douse my wounds in filth. Attention, godslayers! Detestable Rakshasa Kings!" <!--Monarchs? didn't check terminology-->