🧠🧠🧠 Church Closed (Lost Piece Exercise)

Lost Piece Exercise: The audio will tell you the position of most of the pieces on the board. Can you work out where the missing piece is meant to be?

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FEN for today's exercise:
r1r2nk1/3q2p1/pp1bp1Q1/3p2Pp/3Pn2P/1N6/PP3P2/K2NR1R1 b - - 2 1

And the answer is...
Be3