- Magic in Heroes 3

If we consider all the spells as a whole, then Earth magic is slightly better than the others, and this can be easily verified!

1) Level:
a) Slow (a very frequently used spell)
b) Stone Skin (not often, but the spell itself is very useful when you have a large army)
c) Shield (same as b)

2) Level:
a) Wave of Death (a very effective spell, especially at the beginning of the game)
...and that's all for level 2; here, Earth magic loses to all other types of magic.

3) Level:
a) Raise Dead (very effective, especially for Necromancers, as this spell has a 100% chance of appearing in level 3 magic)
b) Earthquake (a very useful spell when sieging a city, if the forces are roughly equal)
...there's not much else, but level 3 magic, apart from the clone, is generally not very impressive.

4) Level The strongest! Here, "Earth" has surpassed everyone!
a) Town Portal (everyone uses it; if it weren't for this, I wouldn't have completed half of the maps!)
b) Meteor Shower (a very effective spell, especially good in the middle of the game, but it is also a specialty of two heroes from Necropolis - Aislin, and from the Dungeon - Deemer, respectively, which gives a certain advantage at the beginning of the game)
c) Resurrection (restores creatures killed in battle; you can only dream about this; I personally use it to save the population of my army)

5) Level:
a) Explosion and again Explosion (the best magical spell; everyone who can uses it!!!)
b) Summon Earth Elemental (it has saved my skin more than once)

So, let's summarize: I haven't covered all the spells, but these are the most effective ones. Moreover, you can't do without half of them!