Guild Wars 2: Heart of Thorns content


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Disambig icon.png This article is about the engineer skill. For the ranger downed skill, see Thunderclap (ranger skill). For the Lightning Hammer skill, see Thunderclap (Lightning Hammer skill).



Engineer icon small.png Engineer (skill list)
Scrapper icon small.png Scrapper
Weapon slot empty tango.pngWeapon slot empty tango.pngWeapon slot empty tango.pngWeapon slot empty tango.pngWeapon slot filled tango.png
Game link
Thunderclap targeting.png

Appearance when choosing where to target.

0.75¾ Activation time  20 Recharge time  

Ionize an area, bringing down the power of lightning to stun foes and damage them over its duration.

Damage.png Damage (5x): 1,615 (4.0)?
Damage.png Damage (5x): 910 (2.25)?
Vulnerability.png Vulnerability (8s): +1% Incoming Damage, +1% Incoming Condition Damage
Vulnerability.png Vulnerability (6s): +1% Incoming Damage, +1% Incoming Condition Damage
Stun.png Stun: 1 second
Miscellaneous effect.png Pulses: 6
Interval.png Interval: 1 second
Radius.png Radius: 240
Combo.png Combo Field: Lightning
Evade.png Defiance Break: 100
Range.png Range: 1,200

— In-game description

Related traits[edit]

Explosives Explosives

Firearms Firearms

Inventions Inventions

Tools Tools

Scrapper Scrapper


  • Stuns and does no damage on the initial tick, followed by 5 damage pulses.

Version history[edit]

For a detailed skill history, see here.

Patch Changes
February 28, 2022 End of Dragons release:
  • (Undocumented) Added tooltip fact Defiance Break.
July 07, 2020
  • Icons for daze and stun are now displayed in light purple in skill and trait tooltips.
February 25, 2020 Competitive content update:
  • (Competitive split) Reduced power coefficient per strike from 0.8 to 0.45. Reduced vulnerability duration from 8 seconds to 6 seconds.
October 01, 2019
  • Increased damage by 6%. Reduced recharge from 24 seconds to 20 seconds.
July 26, 2016
  • This skill no longer deals damage on initial impact, but it still stuns enemies.
  • Damage for all pulses has been increased by 26%, for an overall damage increase of 5%.
February 23, 2016
  • Updated the area-of-effect rings to show combo rings to allies and red rings to enemies.
October 23, 2015 Heart of Thorns release:
  • Thunderclap has been added to the game.