O is for Odin, father of all the gods in Norse Mythology

"I hung on that tree for nine nights pierced with a spear, an offering..."

You would think reading this Odin was being tortured but he did this and more to HIMSELF in order to gain knowlege and mastery of the runes.

Some of the spells Odin learned:

Help from pain, sorrow and sickness
To Blunt an opponents weapon
Unbinding
To arrest a speeding arrow
To stop the fire that will burn his comrades
To uproot hatred in a man's heart
To protect a child from death in battle
To win the heart of a maiden

Some of the names of Odin:
Grim, Gangleri, Raider, Helmeted One, Thud, Ud, Death Blinder, Spear Thruster, One-eyed, All-Father, The Hooded One, Glapsvid, Fjolsvid, Long Beard, Vidur when in battle, and at the council of the Gods Thror.