You can certainly try.

[Gilgamesh does not sound threatened. Though he doesn't exactly sound angry, either, due to already dismissing this individual's provocations.]

I possess a sword that destroys worlds, that can cleave cities, end empires with a single swing. If you can contest its strength, I will acknowledge you as a worthy adversary. If you cannot, I would strongly advise you to stay away. I have no desire to take any of your lives, but I will do so if necessary.