Get 19 rexes with 40k health and 600 melee with mastercraft saddles. They will be used as crowd control for the dimorphs and teras. You will need a male deer with 10k health and a journeyman+ saddle. Get the deer under he dragon when it lands so it gets stuck. Have shotguns with 180+ damage to them shoot the dragon. And also, make sure you have journeyman+ tiered flak to bring in too!! 2-3 sets of armor recommended
First of all you can’t knock it out just like all other bosses. Second, in order to kill it I would recommend mutated therizinos with ascendant saddles, about 17 of them. You can give the therizinos sweet veggie cakes for them to heal on their own. I would bring 2 daeondons and 1 yuty which are both better when someone is riding them.