It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.entity.type.projectile.LargeFireball;

LargeFireball extends Fireball. That means all methods available in Fireball are also available in LargeFireball

ZenScript
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new LargeFireball(level as invalid, shooter as LivingEntity, xPower as double, yPower as double, zPower as double) as LargeFireball
new LargeFireball(level, shooter, 0, 1, 2);

Parametro	Tipo	Descrizione
Parametro level	Tipo invalid	Descrizione The level the entity is in.
Parametro shooter	Tipo LivingEntity	Descrizione The entity that created the fireball, used to get the position.
Parametro xPower	Tipo double	Descrizione The x power of the entity.
Parametro yPower	Tipo double	Descrizione The y power of the entity.
Parametro zPower	Tipo double	Descrizione The z power of the entity.