Power Holosmith Hammer GW2 Holosmith WvW Builds
Holosmith replaces tool belt 5 with 
Engage Photon Forge. Turning it on gives you a second skill bar, generates heat while it runs, damages you if you overheat, and briefly locks you out of your kits. 
Laser's Edge scales your strike damage with the heat you are currently carrying while the Forge is up, so the loop is simple to describe and hard to execute: get hot, stay hot as long as you dare, drop out before the gauge kills you.
The specialization also unlocks Exceed skills. 
Prime Light Beam is the one you save for the push — above the heat threshold it leaves a burning holographic field behind it — and 
Spectrum Shield is the defensive Exceed, a stun break with 
Stability that our damage build does not take.
We run one Holosmith build: a Hammer power build in Berserker's and Dragon's that shares the Explosives and Firearms core with Scrapper. It asks more of you than that build and forgives less. The heat gauge is the whole difference.
1 Holosmith build
Power Holosmith Hammer Playing Holosmith in WvW
Heat is not a resource you spend, it is one you sit on. Laser's Edge pays you while the Forge is active in proportion to your current heat, 
Enhanced Capacity Storage Unit raises the ceiling and drips might once you are over 100%, and 
Heat Therapy heals you back as the heat drains — but not while you are cooling from an overheat. Overheating therefore costs you the damage, the healing, and the seconds.
Read 
Solar Focusing Lens carefully, because it does not do what its name suggests: it burns and boosts your first few attacks after you *enter or exit* the Forge, and after an overheat. It is a reward for cycling the Forge, not for living in it. Learning where those two pulls meet is most of learning the spec.
The rest is Engineer. You are on a Hammer in the melee ball with kits on the bar, and engaging the Forge locks those kits for a moment, so the button that raises your damage also takes away your 
Elixir Gun and 
Flamethrower for a beat. There is no stun break on our build's bar. Holosmith punishes a bad second more than most things you can bring to a zerg.