Activators can come from any mob of the same type, just like the spawners do. From my experience, the harder the mob is the more likely to drop the rarer spawners and activators, just like real loot is. I can confirm even low level ettins drop the Duhjalm Sentinel, but in Kraytocks they are a dime a dozen (drop from pretty much every trash encounter). The Libant Frostfuser, i got 6 from one clear of the castle (1 from the basement in Catacombs, 2 from the first floor and 3 from the epics on second floor). Also got the Empowered Terror Activator from a normal mob somewhere in the world (i dont remember what zone, but i have not run any instances ).
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