Eureka

In the Arcane Mage talent tree, Eureka sits in the Arcane specialization talents, row 9 of 11. It is a single-point node. Its row opens once 20 points are spent in Arcane Talents.

Connected above

The tree draws a line into Eureka from Focusing Crystal and Enlightened.

• 
  Focusing Crystal

  Each wave of Arcane Missiles has a 50% chance to grant 1 additional stacks of Arcane Salvo.

• 
  Enlightened

  Arcane damage dealt is increased based on your current mana, up to 6% at full mana.

Connected below

Eureka leads on to Overpowered Missiles.

• 
  Overpowered Missiles

  Gaining Clearcasting has a 25% chance to cause your next Arcane Missiles to be Overpowered, causing it to deal 100% increased damage, generate maximum stacks of Arcane Salvo, and strike 3 additional targets at 50% effectiveness.

Same row

Also on this row: Prodigious Savant and Arcane Singularity.

• 
  Prodigious Savant2 ranks

  Arcane Charges increase the damage of Arcane Blast and Arcane Barrage by an additional 10%.

• 
  Arcane Singularity2 ranks

  Arcane Salvo damage bonus increased by 2%. : Increases the damage of your next Arcane Barrage by 3%.