Strength
Strength is a buff that permanently (for the duration of combat) increases the damage of every Attack hit by an amount equal to its stacks. For example, 5 Strength adds 5 damage to each individual hit of every Attack card played. This makes Strength especially powerful with multi-hit cards, as the bonus applies per hit rather than per card.
Strength is a cornerstone of The Ironclad's kit, appearing on cards like Inflame, Limit Break, Demon Form, and Spot Weakness. Enemies can also gain Strength, making it critical to deal with buffing enemies like Cultists quickly. Strength can be reduced by cards like Shockwave or the Disarm card, and some Act 1 enemies like Lagavulin will drain your Strength as a debuff.