Eureka

Eureka is a legendary mace crafted in the Mystic Forge, connected to the Heart of Thorns expansion through the required tasks and materials.

What it looks like

Aura

• The arm wielding Eureka glows red from the heat and grows crystals of red and purple obsidian, which constantly change in size and location.

Draw/Stow Animation

• The character lights up in flames, similar to a Warrior's Berserk, and shards of flaming obsidian shatter off the body while making a sound of crumbling rocks.
• Lightning surges along the hilt, while the mace's prongs fold up and molten obsidian gathers at the tip to form the mace head.
• Once cooled down the mace head shows small embers inside, while emitting red-grey flames and silver sparkles.
• Stowing the mace will cause the head to cool off completely, and ultimately to shatter into small shards of obsidian. The previously extended prongs fold back into the initial state.

Footfalls

• The footfalls consist of reflective shards of obsidian in various sizes that erupt from the ground.

Skill effects

• Swinging the mace emits a dark heavy sound and leaves a bright trail of red light.
• Default projectiles are replaced with a flaming spike ball of obsidian similar to the mace head. This effect changes the following skills:

Unlock text

Eureka was the pride and downfall of a rogue Priory research team who set out to reactivate obsidian shards sampled from ancient armor. Paired with magitech, the material assumed a deadlier form.

What it takes

Combined in the Mystic Forge, from:

1 × Endeavor1 × Mystic Tribute1 × Gift of Eureka1 × Gift of Maguuma Mastery

Each of those breaks down further — often a long way. Track it in the tracker to see the whole list with what you already hold subtracted, and where each missing piece comes from.

Eureka on the Guild Wars 2 Wiki