History of Boss Annihilator

Boss Annihilator (Episode: Heresy ritual triumph): "Defeat bosses or minibosses of different factions in the Court of Blades."

How to complete

• Court of Blades is a boss rush on the Dreadnaught (1-3 players, 10-minute timer). The activity ends after 13 challengers or when time runs out; two bosses (one small, one major) appear per phase.
• Challengers come from three factions, so you need kills across them: Blood of Oryx (Dread and Dire Taken), Lucent Brood (Hive) and Wrathborn (Hive aligned with Xivu Arath). Faction rotates by run, so repeat the activity until you have seen each.
• Spend runes between encounters; the Queenbreaker-style high-damage weapons help finish bosses before time runs out.

Unconfirmed: the exact count of factions required is not stated in the sources I opened; assume all three. See Episode: Heresy.