A Lump of Coal

A Lump of Coal is an unlockable passive item.

Effect

 * Tears gain a flat damage bonus based on how far they travel. This starts at +0 and increases to about +6 at a standard room's width (but can go higher).

Synergies

 * : Bone tears will grow in size and damage as they travel; however, bone shards will only increase in damage.
 * : Combined with a good amount of range or shot speed, tears travel through the room walls back inside and deal even more damage.
 * /: Fired tears will increase in size and damage as they travel. Split tears will increase in size and damage as well; however, the gradual increase in size is barely noticeable because split tears will disappear very quickly.
 * : Needles will increase in size and damage as they travel. Burst needles will also increase in size and damage.
 * : Tears will gain damage as they travel.
 * : Tears and auras will increase in size and damage the farther they travel.
 * : Tears and burst tears will increase in damage the farther they travel.
 * : The extra distance traveled from zig-zagging increases Coal's damage.
 * : Increases the tear's damage and size the farther the tear is from Isaac. Even at close range it will still do about +3.5 damage.
 * : Fear shots cause enemies to run away allowing Coal's damage to increase longer.
 * : Coal's bonus is based on total distance traveled so it does benefit (slightly) from Reflection.
 * : Tears will increase their damage and size as they travel, and they are not limited by range.
 * : Tears will retain crescent shape and increase in damage based on how far they travel. Tears will very slowly increase in size as they travel.
 * : It gains more air time with the bouncing, allowing for every bounce to add damage.
 * : Coal's flat damage increase is applied after Soy's reduction, so tears gain the full benefit from Coal.
 * : The significant range up increases Coal's damage potential, despite the shot height being halved.
 * : Electric lasers will increase in damage based on how far the tears travel.
 * : This item drastically increases the screen time of tears because it makes them orbit around Isaac for a few seconds. The character's tears gain about +15 damage for a fully orbited tear.

Interactions

 * : Poor synergy - Despite the fact tears grow in size, they will still only deal bonus damage based strictly on how far they travel. If the enemy hits the tears by running into them, Coal will add no damage no matter how big the tears are.
 * : Damage of the Athame ring is halved.
 * This bug has been fixed; the ring deals normal damage.
 * + - Makes the Brimstone circle widen and deal damage based on how far away it is from your character.  At very close ranges, damage is reduced to about 73% (unlike normal Coal effects).
 * : No benefit though the beam color is darker.
 * Beam will gradually increase in size and damage the farther it travels, on a multiplier that is roughly +20% per tile of distance.
 * : No benefit.
 * : No benefit though the bombs appear darker.
 * : No benefit.
 * : Benefits exactly like normal tears.
 * : Tears will grow until they burst, though their actual damage bonus is only based on distance traveled. Burst tears will also grow as they travel.
 * : Damage of the Maw ring is halved.
 * This bug has been fixed; the ring deals normal damage.
 * : No benefit.
 * : Proptosis scales with Isaac's damage while the Coal does not. At base damage, tears will have approximately the same damage at any range; with increased damage, tears do more damage up close.
 * /: No relevant additional benefit (either very minor or none at all).
 * : No benefit.
 * Damage increases the further away the enemy is, on a multiplier that is roughly +20% per tile of distance.
 * : No benefit.
 * Damage increases the further away the enemy is, on a multiplier that is roughly +20% per tile of distance.
 * : The laser ring will grow as the ring distances itself from the player, but will shrink as the player approaches it. Damage increases the further away the enemy is.
 * : The damage of the lasers is increased by a negligible amount.

Trivia

 * In Western culture, children are commonly told that if they behave badly during the year, they will receive a piece of coal for Christmas.
 * This makes A Lump of Coal a fitting item for Krampus to drop, based on his origins.