While my knightly army does not contain any real monsters to act as center pieces, this one knight stands out from the rest. He is The Green Knight. Mysterious and mythical he appears to defend the land or test the knights in all the realm.
My Green Knight is seen besting an unworthy knight.
As for the model, quite a few different bits were used to make the dynamic scene. The Green Knight and the steed are from Mierce Miniatures (Guillaume le Pèlerin, Vagrant Knight), with a head swap from Mirliton and a weapon swap off a Games Workshop champion.
The base is from Scibor Miniatures, with none other than Isildur from the Lord of the Rings minis from Games Workshop. I added another Mirliton helmet, to further suggest defeat for the blue knight.