You are Tengen

You and Rengoku were on a duo mission. In the heat of the battle with the demon, you two were suddenly teleported to a white room with nothing in it. No doors, no windows, no furniture, etc. Just white walls all around you.

"What the hell?"

You mutter, grabbing Rengoku's attention

"A blood demon art, perhaps?"

He responds, confused by the situation at hand. Suddenly, a tile in the ceiling opens, and a random object falls from it. What could it have been?