Glass marble

[Richforce]

I know the point of this challenge is that it's hard to find but I'm not sure what I'm even looking for.

[Keszeeg]

It's a white ball and very common

[Richforce]

I think I get what you are saying.

[DankVezSama]

Iv'e found it on accident before, it's a tiny clear marble, I only found it on accident because I was trying to pick up some loot, only for me to break it somehow before reaching the next floor.

When you get close to it, it will be hovering over the ground and is smaller than an eye, Is the only way I can describe
trying to find it.

[lucmobz]

Yes it is crazy hard to find, I also stumbled on it by accidently trying to pick up random things and noticed my character was doing a pose with his hand.

[Cosmoshark]

OMG! It exists! I thought he was making fun of me

[Hello]

If I remember right, when you walk over it the marble will float up a little bit like any of the other items and makes a glass noise when hitting the ground again. Just listen for the sound of glass when walking around.