Can I slow the preparations for war

Hint 1 of 5:

Have you been to the sword sharpening room?

Hint 2 of 5:

Wait until it is quiet.

Hint 3 of 5:

Then cast DULL (SHARPEN in reverse) on the sword.

Hint 4 of 5:

You did find SHARPEN in the city, didn't you?

Hint 5 of 5:

Get SHARPEN from the sythe.