Molten Armaments is a Dragonknight Class Ability, found in the Earthen Heart Skill Line.

Molten Armaments
4050 Instant Cast Target: Self Base Skill: Molten Weapons
Charge you and your grouped allies' weapons with volcanic power to gain Major Brutality and Sorcery, increasing your Weapon and Spell Damage by 20% for 30 seconds. You also gain Empower for the duration, increasing the damage of your Heavy Attacks against monsters by 80%.

Molten Armaments is a morph of the Molten Weapons base skill. The other morph is Igneous Weapons.