Deamons/executioners :)

Yeah.
The only way to heal them, I think, is the dancing axes skill of Shamans.
And I also think the only magic spell that affect them is Armageddon.

Am I right?

and death star .. its sweet in ultrax

I don't think any ONE unit is mandatory for a party, but the different roles are:

Tank - Something with High health and defense, hopefully good resistances too. Best if rezzable, but not always necessary.

Control - A unit that can remove a problem stack from combat. Ogres, Dryads, Shamans, etc.

DPS - Unit that does a lot of damage, generally without giving the enemy the ability to retaliate. Supports the tank, tries not to ever take damage. (Vampires, Royal Snakes, Fairies, Archers, etc)

Summon - Units that can create summons to take blows, draw out retaliations, and null spells. (Dryads, Royal Thorns, Chosha's, Royal Griffons)

Healer - Unit to heal or ressurrect tanks and DPSers. Hopefully never is attacked directly

A lot of the best units will do multiples of these roles. For instance:

Demonologists: Summoner/Healer
Royal Griffon: Summoner/Tank
Paladin: Healer/Tank (Self rezzing tank!)
Dryad: Summoner/Control
Evil Beholder: Control/DPS
Dragons: Tank/DPS
Ogre: Tank/Control

It gives you a good idea for why they do what they do so well.

In my current game I got a stack of Archdemons with a Call of Colossus and I have been loving them. They have one of the highest inititives in the game so you'll always go first. Their teleport ability means you can instantly engage any troublesome unit on the map or you can reach any chest on the map in one move. They are tough enough to avoid getting any loss on most occasions in early to mid game. Their 'halve' ability can really reduce an enemy stack quickly.

If you get these very early you can literally drop one in the middle of an enemy formation and sit watch the chaos without much danger of losing it.

In late game when enemy stacks are big enough to actually kill an archdemon with a counter attack, I hold their action to the last. This way I can target weakened enemies or ones that can't fight back. Since they get to go first every round, you can then move them back to safety next round and still have enough moves to reengage again.

I think you mean "Rock and (T)roll" :twisted::twisted::twisted: