Silver Warrior (1972) by Frank Frazetta.
This painting was used as the cover for The Silver Warriors by Michael Moorcock (published in the UK as Phoenix in Obsidian). It is the second book in Moorcock's trilogy featuring the Eternal Champion, Erekosë (the first being The Eternal Champion, and the third being The Dragon in the Sword).
Erekosë manifests in this adventure as Count Ulrik Skarsol, Lord of the Frozen Keep. He eventually arms himself with the Cold Sword, a more powerful version of Elric's evil, vampiric black sword Stormbringer (Elric also being an aspect of the Eternal Champion).







