Purgatory in Warzone is a new LTM (limited-time mode ... which requires you to purchase a Juggernaut Suit. You can buy a Juggernaut Suit from the Buy Stations for $40,000 in-game cash.
Just before the launch of Call of Duty: Black Ops 6, Xbox is stopping its historic cheap Game Pass deals, much to the annoyance of players wanting to load into the action without breaking the bank.