The vizier keeps killing me!

Hint 1 of 8:

You need something to defend yourself.

Hint 2 of 8:

It has been conveniently placed on the wall next to Alex.

Hint 3 of 8:

Pick up the sword and click that icon on the vizier.

Hint 4 of 8:

Eventually, you'll need someone else to step in to help you.

Hint 5 of 8:

You should have talked to Cassima from within the castle.

Hint 6 of 8:

She needed something to defend herself.