Extinction Event
Extinction Event is a members achievement in the Combat category (Rex Matriarchs), worth 15 RuneScore points. It has no requirements.
In game: “Defeat the Rex Matriarchs, Pthentraken, Orikalka, and Rathis, all within 5 seconds of each other. Can only be completed in a solo instance.”
15 RuneScoreCombatRex MatriarchsMembersHard combat achievement
Updated . From the RuneScape Wiki's achievement data (CC BY-NC-SA 3.0), checked 2026-10-09. Wiki page.
Requirements
None: any account can do this one as soon as it reaches the right place.
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