Vault

Vault is a Watcher rare skill that ends your current turn and grants you a complete extra turn afterward, then Exhausts for 3 energy. This extra turn is a full turn with a new hand draw and full energy — effectively doubling your actions for one combat moment. Playing Vault on turn 3 means you get turn 4 immediately after, essentially getting 6 energy worth of turns for the price of the Vault turn's remaining energy. In a full Wrath burst setup, Vault turns a good turn into an extraordinary one.

Vault is best used when you've built up a powerful enough board state that an extra full turn will win or nearly win the fight. Entering Wrath and playing Vault means you get two full Wrath turns back-to-back — each with doubled damage — without the enemy getting to act in between. The 3 energy cost and Exhaust limit it to one use per combat. The optimal sequence often involves Calm cycling to save up energy, entering Wrath, playing Vault, and flooding both turns with attacks. Upgraded, Vault no longer Exhausts, allowing it to be used across multiple combats.