Power Amalgam Hammer GW2 Amalgam WvW Builds
Amalgam is the Engineer's newest elite specialization and it rewrites more of the profession than the others do. 
Experimental Union makes you host to a mercurial mold: you command it with morph skills that replace your tool belt skills, or merge with it entirely to Evolve. Its utilities are stances rather than kits or gadgets, and the morphs are Protocols — 
Offensive Protocol: Shred cripples and can immobilize, 
Defensive Protocol: Protect briefly blocks.
We run one Amalgam build, and it is the most committed glass cannon in this library: Hammer in both slots, Berserker's and Dragon's gear, 
Scholar runes, and three traitlines that all cash out as damage. 
Flux State is the button that earns the slot — a magnetic field that pulls enemies into your squad's bomb — and 
Plasmatic State raises your outgoing strike and condition damage for a duration. Both are stances, and both trigger 
Stainless Steel, which turns conditions on you into boons and is the only cleanse the build carries.
1 Amalgam build
Power Amalgam Hammer Playing Amalgam in WvW
The tool belt is the spec. 
Symbiotic Synergy recharges your morph skills on Evolve and makes them hit harder; 
Willing Host raises your damage for a duration each time you use one; 
Hybrid Vigor gives you vitality and 
Barrier on each morph. That is the loop — press morphs, Evolve, press them again — and it is where a build with no defensive stat gets what little padding it has.
Silver Lining decides how you get your strain bonuses: they come from the morph skills themselves rather than being inherited by Evolve. It suits a player who morphs on cooldown rather than saving a merge for a window.
Where it struggles is the same place every hammer Engineer does — you are in melee, in glass, and the Firearms and Explosives traits only pay at close range and high health. Amalgam is not stranded there: 
Elixir Gun is a ranged kit and its 
Acid Bomb is a backward leap out of a bad spot. But 
Stability costs you a slot, 
Solid State is the stance that provides it, and a build that takes it is a build with one less damage stance. That trade is the whole conversation about playing Amalgam in a zerg.