Grimm are, I suppose you could say, monsters. They're soulless creatures whose only instinct is to destroy.

[ She turns to face him, crossing her legs once more. A Glyph appears next to him on the floor, a white one that glows a light blue. Kazuya might even feel and smell it— her Aura.

From the Glyph surfaces a suit of armour that gets as tall as the door. She can make it bigger, sure, but there's no point. It kneels before Weiss once it's been summoned, the sound of metal and steel clanking present when it moves. ]

This isn't how all Grimm look; there are various types. And they certainly don't look like this when you actually face a living one. They're usually black, with a mask on and everything.

[ Considering how her soul practically radiates from this creature, it's not as "soulless" anymore as she describes Grimm to be. ]

I'm able to summon Grimm that I've defeated in the past. And in Remnant, it's only people from my family who are capable of doing so.