Runic Overflow

In the Frost Death Knight talent tree, Runic Overflow sits in the Frost specialization talents, row 4 of 11. It takes 2 points to fill.

Connected above

The tree draws a line into Runic Overflow from Killing Machine and Empower Rune Weapon.

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  Killing Machine

  Your auto attack critical strikes have a chance to make your next Obliterate deal Frost damage and critically strike, or make your next Frostscythe critically strike for 4 times the normal damage.

• 
  Empower Rune Weapon

  Drain the will of your enemy to empower your rune weapon, dealing (260% of Attack Power) Shadowfrost damage and reduced damage to enemies nearby, gaining 40 Runic Power, and grants you Killing Machine.

Connected below

Runic Overflow leads on to Frostreaper.

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  Frostreaper

  Obliterate deals 10% increased damage and has a chance to tether the souls of its target and a nearby enemy to yours. Frost Strike severs the tethers, dealing (411.8% of Attack Power) Shadowfrost damage to both foes.

Same row

Also on this row: Arctic Assault, Frostbound Will, Runic Command and Biting Cold.

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  Arctic Assault

  Consuming Killing Machine fires a Glacial Advance through your target at 60% effectiveness.

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  Frostbound Will

  Consuming Rime reduces the cooldown of Empower Rune Weapon by 6 sec.

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  Runic Command2 ranks

  Increases your maximum Runic Power by 5. Increases Rune regeneration rate by 10%.

• 
  Biting Cold

  Remorseless Winter damage is increased by 35%. The first time Remorseless Winter deals damage to 3 different enemies, you gain Rime.