For 10 points, name this supreme deity of the Norse Pantheon.
In one story, this figure tested his favorite mortal king Geirrod by visiting him in the guise of Grimnir. With the help of his brothers Vili and Ve, this figure killed the primordial giant Ymir. Master of the ravens Hugin and Munin, this figure will kill and be killed by the Fenris Wolf at Ragnarok. He gave up an eye to drink from the well of Mimir, and he is also called the "Allfather." For 10 points, name this supreme deity of the Norse Pantheon.
In one story, this figure tested his favorite mortal king Geirrod by visiting him in the guise of Grimnir.
{Odin} [or {Wotan}]