Taser

Slows enemies in a radius around the projectile

Unlock: Available from the start
Starting weapon for: 29 characters

Community builds that use it

DemonItems cost Max HP, so early shopping at very low HP is normal; Ghost Scepter (which grants HP on kills) and Thief Dagger are the late-game picks, and Lightning Shiv the beginner-friendly one. Sharp Bullet helps Ghost Scepter clear.
EntrepreneurThe -50% Damage modifier pushes most guides to an Engineering build with Wrench turrets, which ignore it; Support weapons such as Sickle and Pruner exploit the boosted Harvesting. Spend all materials every shop because they are lost at the start of the next wave.
ExplorerEngineering avoids the -40% Damage penalty, with Pocket Factory the key item; Cacti Club spines also cut down the extra trees. Shredder explosion builds and Sticks are other recommended starts.
MageElemental build carried by the starting Scared Sausage and Snake: buy more of both, stack Elemental Damage and Attack Speed, and use Tasers (slow plus Support harvesting), Icicles or Lightning Shiv, adding Flamethrowers when offered. Torch is suggested as a tankier start before switching around waves 8-9.
OldThe small map favours Engineering: Wrench turrets and Landmines stay on screen, so stack Engineering and defensive stats. Double Barrel Shotguns are the gun alternative because enemies bunch up; guides also report Taser/Wand elemental builds.
PacifistSix Hands for knockback, Dodge and Support Harvesting, then put everything into Harvesting and defence because weapons only deal 1 damage; Pruner and one Taser are optional additions. Crown is the key economy item.
SoldierStand still to shoot and move only to dodge: Double Barrel Shotgun, SMG or Revolver with lots of Ranged Damage plus some Max HP, Dodge or Life Steal. Javelins (scaling with Melee Damage) are another reported option.
TechnomageEngineering with Wrench turrets is the reported easier route after the XP nerf, while elemental builds use Taser or Plank and buy every structure. Strange Book converts Elemental Damage to Engineering.

Stats by tier

Tier I Common
Damage
7 (+80% Elemental Damage)
Cooldown
0.95s
Crit
x2 (3% chance)
Range
200
Tier II Uncommon
Damage
7x2 (+70% Elemental Damage)
Cooldown
0.95s
Crit
x2 (3% chance)
Range
200
Tier III Rare
Damage
7x3 (+60% Elemental Damage)
Cooldown
0.95s
Crit
x2 (3% chance)
Range
200
Tier IV Legendary
Damage
14x4 (+50% Elemental Damage)
Cooldown
0.95s
Crit
x2 (3% chance)
Range
200

Damage in brackets is added from your stats before %Damage multiplies the total; see the damage formula or the calculator.

DPS at tier IV

60.7 DPS with no stats, 104.1 at 20 Elemental Damage and 169.1 at 50 (single target, every projectile hits, crits averaged): #3 of 12 weapons that scale with Elemental Damage. Full ranking or your own stats.