Jack really is a beast, since we met him he tried to rescue Doflamingo assaulting a Navy fleet with Sengoku and Fujitora. Survived it.
Attacked Zou, kept for 5 days of fighting in a 2v1 while the Dukes had 12 hours turns each, then stopped the shit using the gas.
Took an arm from Neko and a leg from Inu.
Survived when Zunisha swinged the shit out of his fleet. Zunisha.
Fought Ashura fairly in his base.
In Onigashima, was the first Calamity to get into action effectively by reaching the rooftop and guarding Kaido.
Fought the totality of the Sulong Minks Army with only a Number and some Gifters as support. Endured all the shit and beated the ass of all the Army, forcing the Sulong Dukes to intervene.
Was taken down and sent to rest by Kaido.
Now he's back, with his tusk reattached and some bandages on his body, heading straight for the Scabbards location.
A true Calamity.
"The Drought"