I attuned Hammerhead played at least 4 onslaughts a day for a whole week got zero shiny hammerhead, so far this week I’m on blast furnace same result # drop rates are -blam!-
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Had at least 8 shiny Elsie's Rifles despite not focussing on it at all. I focussed Luna's Howl as soon as I unlocked it and have focussed on it all week, had saved over 180 tokens prior to it unlocking and have farmed all week in Onslaught, zero shiny Luna's Howl. I must have broken down well over 50 of the bloody things, easy. Ram that RNG right up your pooper Bungo.