This triumph is bugged. I've reset my valor ranks more than 5x already and it's still 4/5. I just wanna get that triumph before this season ends but bungie won't allow me to. This sucks :(
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This triumph tracks the most resets in a single season. If it is still at 4/5 after resetting then unfortunately you must have reached 4 in a previous season. You’ll have to continue resetting this season until it rolls over to 5/5.