Frost Strike If «Glacial Advance»: , Glacial Advance, and Howling Blast grant Killing Machine and have a 20% chance to generate a Rune.
During Pillar of Frost, Frost Strike 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.
Frost
Obliteration