Killerwatts are Slayer monsters located in the Killerwatt plane, accessed through a portal on the top floor of Draynor Manor. Level 37 Slayer and completion of Ernest the Chicken are required to kill them. Players are suggested to wear insulated boots when fighting killerwatts - not wearing them will result in taking increased damage from the killerwatt's Ranged attacks due to lightning strikes; however, this damage can still be negated with Protect from Missiles. A Dwarf multicannon cannot be set up in the killerwatt plane.
Killerwatts are much more dangerous than what their combat level may suggest; both their Ranged and Melee attacks will hit players every 1.2 seconds, much faster than the speed of an Abyssal whip or scimitars, and their melee attacks are exceptionally accurate, although Prayer flicking is still possible despite their attack speed. Using Ranged or Magic from across clouds will limit them to their Ranged attack, allowing players with protection prayers to safely complete this Slayer task. Their Ranged attack is Magic-based, and thus equipment with high Magic Defence such as dragonhide armour will provide the best protection against the Ranged attack. Contrary to popular belief, their melee attack is NOT magic based, and as such your best melee armor is most effective when using the 'baiting' method (where the player selects to attack the enemy but clicks away before landing their first attack, leading to the killerwatt only using melee attacks).
Killerwatts initially appear as floating balls of electricity, but will grow limbs if attacked. Though they aren't aggressive, they will immediately retaliate after being clicked on, and will try to get within melee range of the player before attacking. Because of this, it is possible to stop a killerwatt from using Ranged attacks entirely by clicking on it with a Melee weapon equipped and then waiting for it to attack first. A killerwatt that has targeted a player will not stop following them until they log out or leave the killerwatt plane.
Item Quantity Rarity GE market price Ashes 1 Always 31
Item Quantity Rarity GE market price Staff of fire 1 Uncommon 1,300 Staff of air 1 Uncommon 1,644 Fire battlestaff 1 Uncommon 9,064 Air battlestaff 1 Uncommon 9,065 Mystic fire staff 1 Uncommon 25,215
Item Quantity Rarity GE market price Grimy guam leaf 1 Common 21 Grimy marrentill 1 Common 14 Grimy tarromin 1 Common 153 Grimy harralander 1 Common 810 Grimy ranarr weed 1 Uncommon 7,294 Grimy irit leaf 1 Uncommon 820 Grimy avantoe 1 Uncommon 1,471 Grimy kwuarm 1 Uncommon 1,051 Grimy cadantine 1 Uncommon 1,166 Grimy lantadyme 1 Rare 1,081 Grimy dwarf weed 1 Rare 581
Item Quantity Rarity GE market price Air rune 5; 17 Common 25–85 Fire rune 18; 45 Common 90–225 Nature rune 8; 37 Uncommon 1,696–7,844 Chaos rune 4 Uncommon 396 Death rune 2 Uncommon 462 Steam rune 2 Uncommon 188
Item Quantity Rarity GE market price Coins 11–21; 44; 127; 156; 200 Common Not sold Cannonball 3 Uncommon 537 Fire orb 2 Uncommon 2,266 Soda ash 4 Uncommon 236
Gem drop table
In addition to the drops above, this monster has access to the gem drop table.
Show/hide gem drop table Item Quantity Rarity GE market price Uncut sapphire 1 Rare 654 Uncut emerald 1 Rare 859 Uncut ruby 1 Rare 1,491 Nature talisman 1 Very rare 1,087 Uncut diamond 1 Very rare 2,905 Rune javelin 5 Very rare 815 Loop half of key 1 Very rare 9,490 Tooth half of key 1 Very rare 11,839 Rune spear 1 Very rare 12,081 Shield left half 1 Very rare 65,708 Dragon spear 1 Very rare 38,162
- *The name is a play on "kilowatt", a unit of power, with the word "killer" included to imply their hostility, or that they may give a deadly amount of watts.
- During Enlightened Journey, and while unlocking routes for the Balloon transport system, some killerwatts can be seen standing on top of clouds, trees, rocks and buildings. Despite this, they cannot be fought anywhere outside of the killerwatt plane.