Blind

Blind is a colorless uncommon 0-cost skill that applies 2 Weak to a target. Weak reduces an enemy's attack damage by 25%, which is a meaningful defensive reduction against high-hitting enemies. As a free card available to all characters, Blind provides debuff support without costing energy, making it usable at any point in a turn without impacting other plays. Against bosses with heavy attack damage, 2 stacks of Weak reduce incoming damage by 25% for 2 turns.

Blind is a flexible defensive option for any character needing Weak application. It synergizes particularly well with the Watcher's Crush Joints (free energy if target has Weak), the Ironclad's Disarm equivalent through cross-character interactions, and with relics that trigger on debuff application. The 0 energy cost means it never competes with your main plays. Upgraded, Blind applies 2 Weak and Exhausts — a slight trade of reusability for a slightly more focused use, though losing the multi-combat reuse is a downside in long runs.