Earthdawn Horrors in the Sixth World, Earthdawn fans, which Horrors would you pick and why? Options

[BigJake]

So, for those of you familiar with the FASA-era supplements (some of which I'm working with for my setting), it's heavily hinted* that during early mana spikes, certain Horrors have managed to cross into the Sixth World and are influencing events. I think it's more or less canonical that Yrsgrathe has made the crossing and has marked Aina Dupree, and that there's at least one Horror (maybe more than one) active at the highest levels of Aztechnology and Aztlan (cf. the 3E Aztlan supplement).

For those of you who are familiar with both the Earthdawn Horrors supplement and the Sixth World, I'd be interested to get your takes on which Horrors from Earthdawn are active in the Shadowrun setting and why you think so. (I have some ideas of my own but would love to get some external perspective before I go trotting them out.)

* I'm not counting the novels here, with which I'm not familiar but a number of which I gather go into a lot more detail. So if you know more about those than I do... love to hear your perspectives too.