Great Fireball is a Pyromancy in Dark Souls 2. To cast a Pyromancy, you must use a Flame or Special Weapons that can cast Pyromancy.
"The strongest form of Fireball.
Creates a giant fireball that is hurled at foes.
The exalted flame, long pined after.
Even if it would scorch our very flesh."
- You need the key from Freja. Go back to the chapel with the spiders on the ceiling before the spider cave leading to Freja and open the locked door.
- Very Rare drop from the Salamander (fire lizard) enemies in Forest of Giants.
Acid Surge ♦ Chaos Set ♦ Chaos Storm ♦ Combustion ♦ Dance of Fire ♦ Fire Orb ♦ Fire Seed ♦ Fire Snake ♦ Fire Storm ♦ Fire Tempest ♦ Fireball ♦ Flame Swathe ♦ Flame Weapon ♦ Flames ♦ Flash Sweat ♦ Forbidden Sun ♦ Great Chaos Fireball ♦ Great Combustion ♦ Immolation ♦ Iron Flesh ♦ Lingering Flame ♦ Magic ♦ Outcry ♦ Poison Mist ♦ Pyromancies ♦ Toxic Mist ♦ Warmth