The Green Knight comes from a power much powerful than Merlin, Morgana, Rue or any other druid or fae.  He is the knight of the Lady of the Lake.  Seeks to test the honour of Knights.  He is Fae, supernatural of the Earth.

History

    "None shall pass!"

        —The Green Knight's challenge.

The Green Knight in battle.

The Green Knight is the sacred protector of Bretonnia, and his spirit-essence is intertwined with the land and the Lady of the Lake. He has appeared to many Questing Knights. They speak of the sky clouding over to create the darkness of twilight, and a green mist seeping from the earth, slowly taking the shape of a figure riding a snorting steed. The warrior brandishes a glowing blade, his eyes ablaze with fey light.[1a]

The Green Knight is the champion of the Lady of the Lake, and protector of the sacred sites of Bretonnia. As well as materialising to test Questing Knights in their faith, the Green Knight will appear when these sacred places are defiled by those with evil intent.

Amongst the beast herds of the tainted forests, he is known as "Shaabhekh", literally the "Soul-Killer," for he has slain untold thousands of their kind throughout the centuries. He bursts from within the bole of the most ancient trees, or gallops furiously from still lakes or rushing waterfalls to wreak his terrible vengeance against those interlopers.

As quickly as he appears, so to will he fade into mist once his righteous slaughter is complete. In some tales, he will disappear in one place only to reappear behind the enemy, slaying them without mercy before again disappearing and reappearing elsewhere.[1a]

He appears to those questing for the Grail and guards the mysterious glades, lakes or stone circles where the Lady of the Lake appears. He challenges any Questing Knight who seeks the Grail to mortal combat. This is the last and final test of the Grail quest.

Weapons have little effect on the Green Knight. Some say that blades and arrows pass straight through him as though he were as insubstantial as morning mist, while in other stories, even the most grievous of wounds inflicted upon him have virtually no effect. In one epic tale, a Questing Knight cut the Green Knight's head clean from his shoulders, but the fey being simply picked up his head and rode away.

What the Green Knight actually is has been much debated, and no one in Bretonnia, save perhaps the Fay Enchantress, knows the truth. Some believe that he is the spirit of Bretonnia given physical form, while others say that he is Gilles le Breton himself, having devoted himself completely to the land and the Lady after he was taken from this world.

At Christmas, a knight who is completely green rides into King Arthur's hall. The Green Knight proposes a game: Any knight brave enough to strike off the Green Knight's head may keep the Green Knight's ax, but that man must accept a return stroke in one year.

The Green Knight carries an axe, an obvious symbol of death and a green holly bob, which some scholars interpret as a symbol of fertility and hope.

The Green Knight's huge stature, wild appearance, and green complexion set him apart from the beardless knights and beautiful ladies of Arthur's Camelot. He is an ambiguous figure: he says that he comes in friendship, not wanting to fight, but the friendly game he proposes is quite deadly.

WAR GEAR & ABILITIES

The Green Knight was one of the deadliest warriors in existence. No one, be it man or monster, could ever truly defeat his immortal form in single combat.

    The Dolorous Blade was a mighty sword of immense size and weight, which the Green Knight wielded with ease. Glowing with a strange light, he would sweep it around him with awesome strength. It was capable of destroying enemies in their droves and was infused with ancient magic.

    The Shadow Steed was a mystical horse of fey power. The steed of the Green Knight was never slowed by its heavy barding.