CATDOLL: What can be summoned when Demon God Saber appears and all 7 colors of my king are collected?

Saber is the heroine in the Japanese anime "Fate/stay night", "Fate/Zero", and "Fate/stay night UBW". She is the legendary King Arthur of ancient Britain. She is loyal, honest, modest, and serious. Because of the inheritance of the holy sword Excalibur, she was summoned to the world as a "Saber" in the fourth and fifth Holy Grail Wars.

This character has been very popular with anime fans since its appearance, and various derivatives and peripherals have emerged one after another. The color of Saber's clothing can also create a variety of different personalities and images. In addition to the common blue clothing, there are white Saber in white clothing, black Saber representing the dark side, and cherry Saber, etc. However, yesterday, a new color of Saber appeared on the Internet in Japan. This Saber should be considered brown, and the name is very cool: Demon Saber. It is just not known which side this character is from, or is it just a new fan work?

It seems that Saber alone is enough to fight a Holy Grail War. I am curious what can be summoned by collecting all 7 colors of Saber? King Arthur's true form? Or the king in a beautiful wedding dress?

Classic blue Saber

Dark Saber

White Saber

Red Saber

Very Japanese Sakura Saber