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On the topic:
Gremlins (initiative +50%, repair) - not that important!
Archmages (increased HP from 18 to 30!, enhanced magic) - not critically necessary!
Titan (becomes a ranged attacker) - also kicks pretty well, silly but cool!)))
Assassin (increased HP, initiative, poison appears) - not critically necessary, how many battles have you decided the outcome with poison???????
Fury (even faster, more initiative, and now without retaliation) - no retaliation is cool, but they still send the entire army against them!
Hydra (+45 to HP, regeneration) - by the time it's their turn, who needs this regeneration!
Griffin (Strike from the Sky, increased attack and defense) - but the archer will move back, and you send your griffin right into the thick of the enemy army, what a brilliant idea???
Inquisitor (+4 to attack and defense, 80 HP instead of 54, magic) - not bad, but not convincing, I don't like the church!
Angels (Resurrection and +40 HP) - not critical at all!
Bears (significant increase in bite strength, claw attack) - extremely important!!!!!
Lava Dragon (+5 to defense and attack, +50 HP, enhanced shield) - extremely necessary!!!!
Cerberus (no retaliation, 3 heads, speed reaches 8!) - no doubt, do it!!!
Demonesses (+50% to HP, chain shot) - here's where it gets interesting, so many praises, but what if against demons?, what if you have units that are weak against them in your army, so it's not that straightforward!!!!
Skeleton (starts shooting, more HP, more damage) - skeletons aren't archers, who needs that, so this is the most important improvement!!!
Lich (+4 to attack and defense, increased damage and HP, magic) - no, it doesn't work
Druids (Significant! increase in attack and damage, improved magic) - no, it doesn't work
Unicorns (+5 to attack and defense!!!, +20 HP, blind) - it's okay, but for those who like it.
So, skeleton archers are definitely the way to go, because has anyone ever kept a skeleton with an axe in their army????? THAT'S IT! Skeleton archers are the foundation of the necromancer's army, you can't say the same about the others!!!