14-15 boss rexes and 1 Yuty. For the rexes I recommend stats to be . . 25k+ Health, 560+ melee dmg. For the Yuty I recommend . . 10k+ health , 3450+ Stm , 110 movement speed, 100% imprint. I usually ride the Yuty while my tribe rides the Rex. Those stats usually work. Never had a rex die. Usually takes about 5 min to beat boss. Once completed we owl heal all of our dinos and rerun the boss fight 3-4 times after. We get a lot of element and Ingot because some people like to buy a seat.

More Broodmother Lysrix Encountering Tips