Here's an Idea, how about a SIVA element, appears the color red like the Hobgoblin sniper shots, raging Hive Ogres/knights, sleeper stimulant, etc. The only thing is what to call it because SIVA light doesn't sound right. Other than that, some sort of Green Light is the most necessary since there are characters like Eris Morn, Dredgen Yor, and various Hive, and Fanatics from the VoG. Frost Light sounds cool but makes no sense, however I would love a Frost Titan or Warlock Subclass.