What it does
"Darkness" isn't a keyword ability—it refers to the iconic card Darkness, a black instant that says: "Prevent all combat damage that would be dealt this turn." For one black mana, it functions as a Fog effect that stops every creature from dealing combat damage during that turn, on either player's attack.
The nuance people miss: it only prevents combat damage, not direct damage from spells, abilities, or noncombat sources. It also doesn't stop attackers from attacking, tapping, or triggering on-attack/on-block abilities—those still happen; only the damage is prevented. Triggers that care about combat damage simply won't fire.
In Commander, it's a cheap, color-appropriate panic button against alpha strikes and one-shot Voltron commanders. Since black rarely gets Fog effects, Darkness is valued in heavy political pods, pillowfort decks, or as surprise protection when facing lethal swings.
Iconic cards with Darkness
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