Lightning needs more charges for a larger AOE, and does less damage the more it hits.
Actually, the "more charges for a larger AOE" applies to both Thunder and Ice Spear, but damage will increase with more charges instead of decrease like the lightningbolt.
Fireball is a true AOE skill because you're not exactly attacking an enemy, but the area the enemy is standing on. That area will be blown up, all enemies in range will be hit.
The original target can actually run away before the fireball reaches to the point.
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