I don't jungle Riven (solo top) and I go Wriggles -> Merc Treads -> Brutalizer -> Frozen Mallet -> Bloodthirster then whatever if it's a fair game and Wriggles -> Merc Treads -> Brutalizer -> Bloodthirster -> Bloodthirster if I'm destroying. Hexdrinker is more of a necessity item as opposed to a "must have in build" item imo.
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~Acting on Impulse~
Black Turtle still didn't MAJORA'S MASK