Bonegrinder

In the Frost Death Knight talent tree, Bonegrinder sits in the Frost specialization talents, row 8 of 11. It takes 2 points to fill. Its row opens once 20 points are spent in Frost Talents.

Connected above

The tree draws a line into Bonegrinder from Cryogenic Chamber and Howling Blades.

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  Cryogenic Chamber

  When Howling Blast consumes Rime, 15% of the damage it deals is gathered into the next cast of Remorseless Winter, up to 20 times.

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  Howling Blades

  Rime empowered Howling Blast unleashes 2 icy blades at its target that deal (25.2% of Attack Power) Frost damage and have 15% chance to grant Killing Machine.

Connected below

Bonegrinder leads on to Obliteration and Icy Death Torrent.

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  Obliteration

  During Pillar of Frost, Frost Strike, Glacial Advance, and Howling Blast always grant Killing Machine and have a 20% chance to generate a Rune. Additionally during Pillar of Frost, Empower Rune Weapon causes your next Obliterate or Frostscythe to cost no Runes.

• 
  Icy Death Torrent

  Your auto attack critical strikes have a chance to send out a torrent of ice dealing (140% of Attack Power) Frost damage to enemies in front of you.

Same row

Also on this row: Smothering Offense, Avalanche and Icebreaker.

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  Smothering Offense

  Your auto attack damage is increased by 10%. This amount is increased for each stack of Icy Talons you have and it can stack up to 2 additional times.

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  Avalanche

  Casting Howling Blast with Rime active causes jagged icicles to fall on enemies nearby your target, applying Razorice and dealing (22.5% of Attack Power) Frost damage.

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  Icebreaker2 ranks

  When empowered by Rime, Howling Blast deals 30% increased damage to your primary target.