Heat Blast

Acquired: MCH (actions)
Level: 35
Type: Weaponskill
Casting: Instant
Recast: 1.5s (GCD)
Range: 25y
Targeting: Enemy
Quest Req.: Always the Last Place You Look
Patch: 5.0

Delivers an attack with a potency of 200.
Additional Effect: Reduces the recast time of both Gauss Round and Ricochet by 15s
Can only be executed when firearm is Overheated.
This weaponskill does not share a recast timer with any other actions. Upon execution, the recast timer for this action will be applied to all other weaponskills and magic actions.

— In-game description

Heat Blast is an action unlocked by questing at level 35. It is available for Machinist.