Critter 'types'

Apart from Robots and Undead, are there any other 'critter types' in-game?

Certain powers (EMP, Ghost Slaying Axe) do special damage versus these types. I just wondered if there were any 'others'.

The only other "types" that i can think of are the hamidon and voids units? Both do "special" damage in that can be unresisted (although i guess voids dont come into that now?).

Would elementals come under it too or are they pure energy class?

Sorry, I was referring to 'types' as in "+Special (i.e. extra damage to robots/undead etc)"

I know that some mobs have their resistances set to different levels. For example Hellions take more Cold damage, Clocks take more Psionic damage and Carnies take more Lethal damage.

I was hoping that there would be a 'few' types because I had an idea (which would be posted in Suggestions) for a new Secondary set. I have a feeling that only Robots and Undead are classed as separate.

Apart from those you mentioned I can think of two more 'types... well, actually two and a half:
- Ghosts, who are also True Undead, but are affected by a few temp powers that have no special effect on other True Undead: Divining Rod, Ghostslayer Bomb/Rifle
- Fair Folk (Fir Bolg, Thuata, Red Caps) all take special damage from the Iron Blade temp power.
- Kheldians are debatable. They certainly do take special damage (although meanwhile downgraded to "not so special" ) from Quantum weapons, but since the Void Hunter Rifle temp power was nerfed to no longer do extra damage to any Kheldian other than the warshade Romulus (mission boss in the corresponding arc) because of villains going trigger-happy on Kheldians in PvP I do not think that a suggestion including special damage against a playable 'type' would be well received.

What about the Thermite Cannon temporary power? The one that you can acquire in the AST.

It seems to deal Plasma damage, but it deals special damage vs Hydra.

http://cityofheroes.wikia.com/wiki/Thermite_Cannon