Coolness

Coolness is a stat that is increased by having specific items.

Effects of Coolness

 * Coolness reduces the cooldown of active items by 5% per point up to a maximum reduction of 50%.
 * The chance for a chest to have a fuse decreases by 2.5% per point in coolness, to a maximum reduction of 10%.
 * Coolness increases the base chance of receiving a chest or reward upon clearing a room.
 * The chance starts off at (1+ [coolness]-[ curse ] )%, and for every room cleared without getting a reward, it increases by a fixed amount (approximately 9% in a normal single-player run), up to a maximum of 85% on floor 1, or 80% on any other floor. When a reward is dropped after clearing a room it goes back to (1+[coolness]-[curse])%.
 * The effect of negative drop chance is unknown.
 * The chance for Vorpal Gun to fire its critical shot increases with coolness.

Increasing Coolness
Items that increase coolness include:
 * Ballot (+3)
 * Cigarettes (+1 per use)
 * Heart of Ice (+1)
 * Ice Cube (+3)
 * Iron Coin (+2)
 * Magic Sweet (+1)
 * Old Goldie (+1)
 * Orange (+2)
 * Rad Gun (+2)
 * Shades's Revolver (+3)
 * Sixth Chamber (+2 for each point of curse)
 * Sunglasses (+2)

Synergies that increase coolness include:
 * Rad Gun and Sunglasses (+1.33)
 * SAA and Box, Ration, Nanomachines, Hip Holster, or Fortune's Favor (+2)
 * Strafe Gun and Sunglasses (+2)

Bugs

 * The coolness that Sixth Chamber provides does not work as intended: it only affects the cooldown of active items, and provides none of the other benefits that Coolness usually does.
 * While the game's code states that only the drop rates of chests gets increased with more Coolness, in practice it has an effect on all drops, not just chests.