[Sky Keeper]

hm. Don't think they removed sea devils (lvl1 fishy with high crit rate and awesome damage under bless) from English version.... So

Best damage dealers:
Sea Devils - they do crit often when you are at full rage..., Skeleton Archers

CC:
Dryads, evil eyes (supply problems, never had a full stack), shamans, archmages (move 1 cell, 50% resist to damage)

I was playing a pally. My army at lvl 12 consisted from Sea Devils, Inquisitors, knights, 1 CC, 1 more damage dealer or CC. changed some stacks as levels and zones go by, but never replaced fishes and rezers.
I was trying to itemize for Attack, use magic and rage to prevent losses (CC)(slow, teleport, trap, summon phoenix and the like..., mirror 1 stack, , stone wall, ice ball, reverse time for a unit, , glot's armor, Recharge all abilities to stack on Inquisitors, or 1 extra turn on Sea Devils). Had no problems on hard - a fishy crit was usually enough to kill 1 stack with other options available to prevent/fix retalliation.
Had giants at one point when it was hard for enemies to do 5000 damage, so they were healable.
Can't imagine my life without "Tactics" skill - it opens alot of options in a fight. Also 30 extra runes in might and magic trees allow for tons of options.