Sorcerer: Endbringer

From BoardGameGeek:

This expansion combined with the Sorcerer Base Game allows 1-3 players for solo and cooperative play. One to three players will team up to battle against a crazed demigod known as a Endbringer. You'll create this adversary by combining a Nemesis (who they are), with an Archetype (what army they lead), and a Scenario (what they are doing). For example you may battle Erling Khan the Deathdealer who is Leading the Invasion. Each of the four different oversized Nemesis Cards comes with a large standee and a unique "Nemesis Deck". At various points in the game, you will reveal the top card of their Nemesis Deck. Each card can generate multiple different effects depending on the game state. The Endbringer defense is spread out among Symmetry Cards, one per battlefield (per player in the game). As Symmetry cards take damage, put damage counters on them. When a Symmetry Card has damage equal to its defense, it is destroyed. Flip it over to reveal a devastating effect the Endbringer unleashes in retaliation. Destroy all the Symmetry Cards and you win the game!