The past, present and future of Earth are colliding as mysterious anomalies open up everywhere. Your mission: keep prehistoric monsters in check, preserve the timeline, and uncover the secrets behind the anomalies. Learn more at our website: http://www.cubicle7.co.uk/our-games/primeval/
Extinction Events are not listed. The Companion does include very nice rules for scaling environmental hazards, all the way up to Lethal at 5/10/15! Depending on your view of how extinction events occur you could combine several environmental hazards at once, or simply rule that the party is extinct.
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