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I played as a Warrior, mainly using Distortion magic. Before I equipped fairies and leveled up my tactics, I didn't neglect mass acceleration; it's a great thing.
Against strong enemies with a small number of ranged units, you can fight effectively using slowing spells, which is also Distortion magic. With those same snakes, you can attack enemies from one cell away without fearing that they will run up and retaliate. Or with other creatures that have unreturned attacks, using the "wait -> attack -> run away" method. Teleport is also a great thing. We attack with a squad of dangerous ranged units and send the hero back to the starting position.
If you have a Reaper and Time Rewind, you can do this with two squads. And if you have ranged units, as a rule, the enemy no longer has the opportunity to inflict serious damage with ranged attacks.
And sometimes, some kind of shackles help out. (Magical ones, I think.) They prevent enemy creatures from using their special abilities. Mass casting is very expensive, though, and it only worked for 2 turns for me, but it was worth it. In difficult battles, for example, I prevented demons from doing various bad things, such as imps casting fireballs and succubi causing chaos in the army.
In the end, Distortion magic turned out to be my favorite. And, in my opinion, it suits the Warrior class better. Or maybe it's just because I leveled it up first and didn't touch other magic until I reached level 3.
P.S. I never learned any Chaos spells from a scroll.
P.P.S. Also, I think that magic in the game is simply a must-have, even for a Warrior. The spells helped me a lot; without them, the result of the Walkthrough would have been much worse. Not to mention that magic increases the number of options and diversifies the Walkthrough.