This article refers to the hidden spell. Azure Dragons have special ability with the same name.
Fear (spell)(Fear)
Fear.png
魔法類型:  Earth Magic
等級:  4
消耗魔法值:  16/8
持續時間:  
 初級效果
Strikes an enemy unit with such fear that it becomes unable to attack and nearly unable to move.
 中級效果
Same as basic effect, but penalty to movement is twice that of basic fear.
 高級效果
Same as basic effect, but penalty to movement is three times that of basic fear.
 出現概率(%):
Town portrait Castle small.gif 城堡   
Town portrait Rampart small.gif 堡壘   
Town portrait Tower small.gif 塔樓    (*)
Town portrait Inferno small.gif 地獄   
Town portrait Necropolis small.gif 墓園   
Town portrait Dungeon small.gif 地下城   
Town portrait Stronghold small.gif 據點   
Town portrait Fortress small.gif 要塞   
Town portrait Conflux small.gif 元素城   
Town portrait Cove small.gif 港口 Horn of the Abyss   
* 沒有圖書館

Fear spell is apparently a disabled feature of 埃拉西亞的光復 version 1.2. The spell could not appear in Mage Guild, but a hero could get a message after defeating the guards in a Pyramid, that he has learned Fear spell: - "Upon defeating the monsters, you decipher an ancient glyph on the wall, telling the secrets of the spell - 'Fear ( disabled )'." However, it also informs that the spell is disabled, and it will never appear in the spell book. The feature was removed in version 1.3.

Greg Fulton, one of lead designers of HoMM3, answered the question why the spell was cut from the game:

The Fear spell was ‘cut’ because it was little more than ‘bad morale’ in another form.  Later, I thought it was better to convert the mechanic into the Fear ability for the Azure Dragon.

Fanstratics Newsletter #5 (January 2021)