"Son of a bitch!" Erandur growled out as he continued his spells on the wound that was bound to the Darkness. Even as it fought back, he fought back harder. The necklace around Artorias' neck began to glow in a bright white light as the Dragonborn drew from its power.
This was nothing easy, and it showed between the two of them.
"MUL QAH DIIV!!" Erandur SHOUTED out. Using the Dragon Aspect, something he hadn't done in thousands of years. His body was covered in multi-colored light, that Shout amplified his magics, the white lights covering his hand shining brighter.
The Darkness in Artorias receding inch by inch into the Soul Gems before they became full. Now came the hard part, using the Black Star to finish this. "Be strong, Knight!"