Shadow Mask

Shadow Mask is a Rare relic that doubles the value of every Weakness application by adding a free Vulnerable stack on top. Since Weakness reduces enemy damage and Vulnerable increases damage taken, every debuff card now provides both offensive and defensive benefits simultaneously. This makes any card that applies Weakness significantly more powerful.

The relic excels in Shadow element decks that naturally apply Weakness frequently, turning every debuff play into a double debuff. It pairs extremely well with Burning Candle, which applies Vulnerable at combat start; adding Shadow Mask means your Weakness cards stack even more Vulnerable on top, keeping enemies debuffed for longer. In builds with multi-application Weakness cards, each application triggers Shadow Mask separately, rapidly stacking Vulnerable.

The relic has no downside but requires your deck to actually contain Weakness-applying cards to function. In decks with zero Weakness effects, it does nothing. Priority: always pick in debuff and Shadow element decks; skip in decks without Weakness application.