When the raid came out on Tuesday I was going to use merciless in the 2nd encounter. I thought it would be good to use, since the "boss" was similar to the crystals in the pools encounter of Leviathan.
I believe the merciless exotic perk isn't working. The rate of fire never increased.
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Pretty shure it and the pocket infinity broke the same exact way and they either can't fix it or just don't care at this point. I wouldn't be surprised if merciless gets sunset in the near future.