Realm tested on: 5.4.2 Fun 
Date of test: 2014.03.05 
Spell: Reaping, Unholy passive 
Description: Whenever you hit with Blood Strike, Pestilence, Festering Strike, Icy Touch, or Blood Boil, the Runes spent will become Death Runes when they activate. Death Runes count as a Blood, Frost or Unholy Rune. 
The problem: None of the underlined spells convert the runes into death runes, so currently Unholy DKs are unable to use Necrotic Strike (only with blood tap). 
Priority: 10