Weapon Damage

Weapon Damage is a stat that increases Bullet Damage, Light Melee Damage, and Heavy Melee Damage.

Math

The formula for weapon damage is: $x_{f} = x_{i} * (1 + \sum_{i = 1}^{n} Shop Bonus + \sum_{i = 1}^{n} BaseAttackDamagePercent) + \sum_{i = 1}^{n} Golden Statues)$
where:
$\begin{aligned} x_{f} & = final weapon damage, \\ x_{i} & = initial weapon damage, \\ S h o p B o n u s & = Increase based on the tier, \\ B a s e A t t a c k D a m a g e P e r c e n t & = weapon damage value, \\ G o l d e n S t a t u e s & = Golden Statue value \end{aligned}$

Sources

All weapon items implicitly provide weapon damage based on tier, represented as "Shop Bonuses" in the ingame stats calculation. Tier 1 items provide +6%, Tier 2 items provide +10%, Tier 3 items provide +14%, and Tier 4 items provide +18%. The following items explicitly grant increased weapon damage:

List of items
Name	Cost	Category	Stat change
Basic Magazine	500	Weapon	+12% Weapon Damage
Close Quarters	500	Weapon	+22% Weapon Damage
High-Velocity Mag	500	Weapon	+11% Weapon Damage
Hollow Point Ward	500	Weapon	+20% Weapon Damage
Restorative Shot	500	Weapon	+3% Weapon Damage
Active Reload	1,250	Weapon	+10% Weapon Damage
Long Range	1,250	Weapon	+10% Weapon Damage
Long Range	1,250	Weapon	+30% Weapon Damage
Melee Charge	1,250	Weapon	+10% Weapon Damage
Mystic Shot	1,250	Weapon	+12% Weapon Damage
Slowing Bullets	1,250	Weapon	+16% Weapon Damage
Soul Shredder Bullets	1,250	Weapon	+7% Weapon Damage
Alchemical Fire	3,000	Weapon	+14% Weapon Damage
Escalating Resilience	3,000	Weapon	+14% Weapon Damage
Intensifying Magazine	3,000	Weapon	+20% Weapon Damage
Warp Stone	3,000	Weapon	+20% Weapon Damage
Headhunter	3,500	Weapon	+15% Weapon Damage
Point Blank	3,500	Weapon	+45% Weapon Damage
Pristine Emblem	3,500	Weapon	+25% Weapon Damage
Titanic Magazine	3,500	Weapon	+18% Weapon Damage
Sharpshooter	4,250	Weapon	+20% Weapon Damage
Sharpshooter	4,250	Weapon	+70% Weapon Damage
Spellslinger Headshots	4,250	Weapon	+12% Weapon Damage
Crippling Headshot	6,000	Weapon	+20% Weapon Damage
Silencer	6,000	Weapon	+20% Weapon Damage
Vampiric Burst	6,000	Weapon	+25% Weapon Damage
Glass Cannon	7,250	Weapon	+70% Weapon Damage
Extra Health	500	Vitality	+7% Weapon Damage
Sprint Boots	500	Vitality	+4% Weapon Damage
Bullet Armor	1,250	Vitality	+6% Weapon Damage
Combat Barrier	1,250	Vitality	+22% Weapon Damage
Debuff Reducer	1,250	Vitality	+8% Weapon Damage
Healing Nova	1,750	Vitality	+12% Weapon Damage
Fortitude	3,500	Vitality	+27% Weapon Damage
Debuff Remover	4,250	Vitality	+20% Weapon Damage
Improved Bullet Armor	4,250	Vitality	+10% Weapon Damage
Colossus	6,000	Vitality	+20% Weapon Damage
Inhibitor	6,000	Vitality	+25% Weapon Damage
Phantom Strike	6,000	Vitality	+30% Weapon Damage
Siphon Bullets	6,000	Vitality	+15% Weapon Damage
Veil Walker	6,000	Vitality	+15% Weapon Damage
Leech	7,250	Vitality	+20% Weapon Damage
Extra Charge	500	Spirit	+6% Weapon Damage
Mystic Burst	500	Spirit	+6% Weapon Damage
Duration Extender	1,250	Spirit	+8% Weapon Damage
Improved Burst	3,500	Spirit	+8% Weapon Damage
Rapid Recharge	3,500	Spirit	+18% Weapon Damage
Superior Duration	4,250	Spirit	+15% Weapon Damage
Curse	6,000	Spirit	+20% Weapon Damage
Boundless Spirit	9,500	Spirit	+30% Weapon Damage

Headshot Booster deals +40 bonus Weapon Damage with headshots.
Monster Rounds increases Weapon Damage against NPCs by +35%.
Berserker increases Weapon Damage by +5% per stack for sustaining damage, where 100 receiving damage equals one stack, maxing at ten stacks.
Headhunter additionally deals +140 bonus Weapon Damage with headshots.
Intensifying Magazine additionally increases Weapon Damage to a maximum of 60% after continuously firing for three seconds.
Glass Cannon additionally increases Weapon Damage by +10% per stack for each hero kill, maxing at seven stacks.

Map spawns

Golden Statues can provide a permanent increase: +3% Weapon Damage before 10 minutes, or +4% Weapon Damage before 25 minutes, or +7% Weapon Damage after 30 minutes.