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);

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