MCDM: Against the Horde (Survival Mode Challenge)!

The dread forces of The Ivory Throne descend on Tale's End. Led by the fearsome Dohma Raskovar a horde of orcs descends on this town looking only to wipe it from the map and from history. The good townsfolk of Tale's End are escaping through the end of a box canyon and four adventurers have taken up The Banner of Glory to buy the townsfolk the time they need.
This event should run about 3-4 hours, but it really depends on YOUR TEAM. This is not your traditional 5e one shot. These will be using monster stat blocks from MCDM's "Flee Mortals" to throw all kinds of orcs at you with different battlefield roles. There are 4 pregen characters: a wizard, a barbarian, a paladin, and a cleric; each with their own ultimate heroic sacrifice ability that ends their life, but delivers one final devastating blow to your enemies. There is a prescribed intiative order that will be the same for every group that attempts this challenge to assure that everyone has the same opportunities to have a great battle because, points will be awarded for certain achievements in game (killing groups of minions, one-shotting enemies, riding a giant bird!).
We will be keeping a leaderboard in the shop for ultimate bragging rights!
Are you cunning enough? Do you have the strategic mind to decimate the forces of Dohma Raskovar? Do you have the stamina to save the people of Tale's End? Will you be immortalized on the walls of Dragons Concord?! Put together a team of four and find out!