Wow! That is one impressive, elaborate sword! Though I think I'm even more impressed that that knight, brawny as he is, would be able to support the weight of that colossal blade as well as that of his immense suit of armour. I can only assume that glow is from the magic of the mighty forces that grant him the preternatural strength to carry all that gear.
Your skill at elaborate details and light and shading is impressive as always!