Well, the eight terrors if your not counting Itassis and Matoombo in this thought. But yeah what if the "eight terrors" ended up in Equestria's Tartarus (not knowing where they are I mean), where they encounter Tirek who is like a insect to them. But he makes a deal with them, if they free him from Tartarus, he can help them take over Equestria.
Well, the eight terrors if your not counting Itassis and Matoombo in this thought. But yeah what if the "eight terrors" ended up in Equestria's Tartarus (not knowing where they are I mean), where they encounter Tirek who is like a insect to them. But he makes a deal with them, if they free him from Tartarus, he can help them take over Equestria.