your right. link says. but the only way to defet him and his minions is with the master sword. and i have no clue where it is

Nogare, as if he were reading his mind, says, "Kasei, from what we know, can be defeated with any weapon. If you seek one such sword, you will need to look beyond the Mountain of Death. But anything beyond there is now guarded by countless Exiles, if not already destroyed. There is still a chance that it survives, but the odds are very weak. We should at least fight Kasei, and learn what his strength is. I will know.

weel, thats true.

And without answering, Nogare dashes eastward. You are going to wish you never did what you have done, Kasei...