Level 55 plus spell drops in Skyfire

[Nirgon]

Kill the shit that player summons in front of VP, the uber wyverns etc. Also, guardian wurms if they're up glhf.

[Arrisard]

I've seen Call of the Hero once and 2 of the higher mage pets (either 58 or 59, can't remember which but it's one of the two) out of several dozen AE pulls (which do not include VP mobs). No idea which specific mobs, other then they weren't VP ent/Ancient mobs.

So, they happen, just not very often, especially if you're only killing one at a time.