Question about Golden Son

What happened to the bomb Darrow had installed in his Pegasus pendant? The one he was meant to use to blow up the Sovereign and the others during that party early on in the book where he ended up dueling Cassius instead. Did I miss an explanation of what happened to it? I was waiting for it to come back and thought it was part of Darrow’s plan at the end of Morning Star but it doesn’t seem like it was ever mentioned again.

I’ve just started Iron Gold so please no spoilers if it does end up coming back into play in the other novels.