This is part of a series on upgrade your starter decks.

The They Who Endure archetype has found many different variations, but they all share a common game plan: use Shadow Isles to produce (and kill off) a lot of token unit, then play a large They Who Endure who either attacks for lethal overwhelm damage or who can be sacrificed to an Atrocity to attack the nexus directly. 

• Our Day2 upgrades are to complete our full set of They Who Endure along with some generally great SI cards like Stalking Shadows, Doombeast, and Barkbeast.
• Now that our deck's a little more refined, on Day3 we can justify adding our optional finishing move, Atrocity. We'll also continue with our series of upgrades, now removing slower cards like Vengeance and The Ruination for early game units like Cursed Keeper, Ravenous Butcher, and Blighted Caretaker.

This starter path can be a little more challenging than the others due to it relying more on synergy with the Day1 cards struggle to provide, but it's also worth investment as its final form is a competitive meta deck in its own right.

If you're interested in this archetype, look to this deck guide when you're ready to invest more.