School of Air Magic
School of Air Magic is one of the four schools of magic. Others are School of Fire Magic, School of Earth Magic and School of Water Magic. School of Air Magic is related to the secondary skill Air Magic, which allows heroes to cast Air School spells more effectively and at reduced cost. The cost reduction is the same regardless of whether a hero holds the skill at basic, advanced, or expert level.
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The most powerful spells in school of air magic are Fly, Dimension Door and Haste. Fly and Dimension Door enables hero to take shortcuts and even ignore Border Guards. In custom maps, they are typically disabled. Another powerful spell in School of Air Magic is Haste, which affects the speed of the creatures in combat. At expert level, it becomes a mass spell, and give +5 speed to all allied creatures. This is such a huge advantage, that it questions why Haste is level 1 spell with such a small mana cost.
Other useful spells in School of Air Magic are Lightning bolt and Chain Lightning. They can do considerable damage in the early stage of the game. However, their usefulness tend to decrease as the game develops and the stack sizes grow allowing troops to do much more damage than spells. Another handy spell is Counterstrike, which also becomes a mass spell with expert air magic. It enables two extra retaliations for allied creatures, which makes it quite deadly specially in the cases like both hydras or vampires. Precision works very well in long battles as ranged units will shoot enemies faster, while Disrupting Ray helps killing more enemies and cannot be cured or dispelled. There are also some spells which are useful on limited occasions but help a lot, namely Destroy Undead which can kill all undead units who appear as wandering monsters or guard a Crypt, and Hypnotize which can be also useful against wandering creatures or weak enemy stacks which can still be a big problem (e.g. Harpy Hags or Grand Elves).
In conclusion, School of Air Magic has only few truly great spells, but they are so remarkable, that if the game is played at its full capacity (no bans), Air Magic becomes mandatory. Haste, or to be precise mass Haste, alone makes Air Magic a winner's choice. However, if Fly and Dimension Door are banned, let alone if Haste is banned, Air Magic and the School of Air Magic becomes significantly less attractive.