what would you say about

a bear army;-)

the normal bear
the ancient bear
polar bear
fire spider
hyena
:)

animals ftw xD

so how's it going?
finished it with your setup yet?

I have not been back to it since about level 25. The one problem with the enjoyment of such a game, is that there is no excitement at finding unit spawns, and you use the same terrible group of units for EVERY BATTLE. I might finish it one day, but not right now :(.

I'd go with

peasants
snakes
druids
unicorns (although ents run them close - yes Elves = most powerful lvl 1 and 2 units and least powerful lvl 3,4,5 units)
ancient ents

As the weakest all-lvl army

Druids are archers, unicorns have high move and damage, as well as resistances. Ancient Ents are actually awesome against non fire damage dealing units, if you teleport them in close.

druids can summon extra units
;-)
and the unicorn is quite strong actually

and ents are also good if used correctly they got huge hp and decent damage but their special is really cool;)

Played more even with this being true. Level 30 now, and done most of the way to montero. It isn't feeling hard, but it definitely doesn't have as much fun due to the lack of choices.

Still haven't gotten 50 no loss battles yet. (41). Berserkers really make that difficult...

Yes and i would add that druids also have generous hp (100) for their level, but i found them weak archers and the bears they summon are very weak compared to say... thorns.

In my exp Unicorns die extremely easy, using the Mystic Egg ability is revealing, i would groan when it brought up unicorns or swamp snakes.

Ancient Ents, fire weakness and mobility problems as others have pointed out.... are disadvantages too far (not to mention difficulty in resurrecting them)... Dragon enemies would be a terrible problem - finally if you lose some they are also rare.

Snipers and elfs are good though (i forgot them).

Others mentioned Ogres, but Ogres' steal action points ability can be very powerful (especially against non-black dragons) if you have the initiative... being level 5's they can also tank for you... a strong unit.

lol
the beserker:P

must be a terrible unit for no loss xD

but isn't their damage quite ok for their level?

does the beserk spell work on beserkers?:D

Damage is fairly decent, but not THAT good. Berserk spell does not work on them, as it doesn't effect mind immune targets (which zerkers are).

And yes, I don't think you'd even have enough berserkers in the entire game if you do not have 100% resurrection paladin skill.