The Falling Rain Blossom was a technique that worked on Sword Heart. He created his Sword Domain around him using this technique, except he chose the origin of the attack and where it ended. That way, he could make it happen straight up to down, making it look like rain.
Su Nian took a step back when he saw Alex's attack. It was limited to only about 10 meters around Alex, but it was still very scary. And more than that, he saw what exactly the rain in the shower was.
"Sword Qi!" he said out loud, causing the others to finally recognize it as well. "What are you doing with Sword Qi? You cannot use a sword."
Alex continued moving forward. "I imagine you're not familiar with someone who has formed a weapon heart. It is incredible. We do not need a weapon to make use of said weapon. In this case, even without my sword, I can easily use my Sword Domain. Speaking of which, everyone beware. My attacks are strong enough to hurt Divinities. You will lose very soon."
