Hey there! The triumph is not bugged. It just wasn’t retroactive after they fixed it so therefore you have to kill the bosses again.
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I don't know when those bosses appear. At each weekly reset, or ?
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Yes each week. So 1 boss a week totaling 3 weeks.
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[quote]I don't know when those bosses appear.[/quote] Heroic Contact. The boss rotates weekly.