EastScape Wikibuilt from the game itself

The Extinction

Level 130 · Boss · attacks on sight.

“A tyrant lizard that swallowed a comet and kept it. It lands in the Primeval Valley when the house calls it, and it does not leave quietly.”

Combat

HitpointsAttackDefenceMax hitAttacks every
60,0001751303602.8s

Resists: Melee 0% · Archery 0% · Magic 0%

Hits with: 🔥 Fire (50% of each hit, and a burn: 25% more over 3 seconds). Gear that resists it takes that share off.

Traits: Brutal (attacks 40% slower and hits 68% harder, a fifth more damage a second) · Frenzied (under 30% health it attacks half again as fast)

Weak to Frost · Resists element Fire — see Magic.

Bring: any style, frost arrows or spells, fire resistance, friends: everyone who helps shares it, food: it hits for up to 360. Comes for you from 8 tiles.

Found in

The Primeval Valley: Only when an admin calls it down on the Primeval Valley (three minutes' warning, ten minutes to kill it). Its Impact hits anyone near it for 95% of their health unless they stand in one of the gold craters; it brings Champion raptors, sabretooths and pterodactyls with it. Everyone who does 1% of its health shares tickets, glimmer and loot materials (Honing Stones, Wax Seals, Wyrdstones and more); the ones still standing at the end each have a 5% chance of a Mythic piece.

Comes back: only when it comes again, as above.