The Question and Answer section for Moby Dick is a great resource to ask questions, find answers, and discuss the novel.
If such a furious trope may stand, his special lunacy stormed his general sanity, and carried it, and turned all its concentred cannon upon its own mad mark; so that far from having lost his strength, Ahab, to that one end, did now possess a thousand fold
From the text:
"....more potency than ever he had sanely brought to bear upon any one reasonable object."
I'm not sure what you mean by "branded".
Which character are you referring to by "he"?