The Maw



The Maw came to be around the first century IC, and was probably the first case of oni summoning by a Rokugani ever. The oni was summmoned and given a name by the shugenja Kuni Nikoma beoming Nikoma no Oni, but almost immmediately, it betrayed Nikoma by slaughtering him, imprisoning itself within the wards Nikoma had set up as a precautionary measure. Around the eight century IC, Nikoma no Oni was given a soul a second time by Isawa Shokan, who freed Nikoma no Oni in exchange for becoming half demon. The oni took care to never let its name (or names) known, and would eventually be known as The Maw by the people of Rokugan.

The Oni Lord
The Maw raised an army in 716 the likes of which had not been seen since the days of Fu Leng and marched upon The Crab destroying Kyuden Hiruma and taking Kuni and Hiruma lands. The Maw was killed in the Battle of the Cresting Wave and its skull purified by Kuni shugenja and hung above the gates of Kyuden Hida as a trophy, and as a warning to the Shadowlands.

The Return
Since the skull is now purified and intact, The Maw is unable to fully spawn into Rokugan and it's spirit was confined to the Forgotten Tomb of Fu Leng, deep in the Shadowlands. Most recently, the Maw's Skull was cracked by the last dying action of Shokansuru, signing dark times ahead with the imminent return of the Great Oni Lord.

Death
The Maw was killed by Oni no Akuma at the Battle of the Tomb in 1168.