I was playing in the Iron Banner playlist on my warlock and got a bond as a drop. I tried it on to see how it looked, didn't like it, and dismantled it. I got the usual minuscule amount of glimmer, but instead of giving me hadronic essence, I got 2 pieces of plasteel plating. It was my understanding that this is a titan-only material. I don't see how I could have got it while playing as a warlock, breaking down warlock armor, on an account that doesn't even have a titan character on it. For anyone who is wondering, the bond was a LV18 version of "The Gone" (link above).
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I've had the same issue with certain warlock bonds. I cant recall which ones, but it's generally the ones whose thumbnail looks like a solid piece of metal