Ill go with Vashta

Oh you must be very acknowledgeable in Doctor Who, I like to hear an explanation.

You should already know how deadly they are. A horde of creatures that groups together and become like a blanket of darkness that consumes anything on contact. Truly like Piranhas in the air.

But can it consume metal, because I'm pretty sure it only consumes organic material otherwise the entire building would've been eaten.

Weeping Angels. Wouldn't the Vashta Nerada just travel back in time if they touch a Weeping Angel?

Yep, that's how dumb the weeping angels are.

Vashta

Vashta Nerada would use the Weeping Angel's strengths against them.

“Silence will fall when the question is asked”

Think is I doubt anyone would be looking away from the silence for their power to work