How to implement Horros in SR, Splitting off from the "cheap ways to defeat the Horrors" thre Options

[Stormdrake]

I relies some SR players do not like the idea of Horrors. No biggie as their inclusion is pretty much up to the individual story teller and his group. For those of us who do want them included how would you implement their existence and powers? Does anyone even have a list of the Horrors and their supposed affinities from ED? I know that some just required a repeat of their name to allow them to take people over or that others existed as music. I also know that many existed in parts, having physical and astral bodies that could spawn replacements if one side or the other was destroyed.

One thing that was mentioned on the other thread was that Horror Marks allowed the Horrors to use those bearing their marks to cast ritual spells through without penalties or worry about wards. That they also allowed the Horrors to take over those so marked and that they could then mark others. For SR this is truly a major power as the Horrors can manipulate, spy and attack without impediment.