What scales attract special units?

[TwoBits]

What are all the various commanders you can get through luck (not counting National Heroes)? I remember seeing:

H2 priest with a bunch of fodder (can be very useful if you get him early)
Ice Druids
Shadow Seers (and maybe another event that gives you Shadow Assassins?)
Necromancers
Animists (is this the guy who didn't want to get staked in your bog, or someone else?)
Amber Clan mages and priests (various different events? Sometimes showing up with free units - mermen, or sea-stags? Can any underwater nation get them, or are they nation-specific?)
Sirens
Druid with a bunch of pigs (or was it wolves? And was he the one who didn't want to get "staked"?)
Asmodiar, the Demon King, with his retinue of 50 Devils (OK, I made the last one up, cause I can't remember anything else, but that would be a pretty cool event )

Is that it then?