Dragon Fireball Effect
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Dragon Fireball Effect is an alternate skill effect for 
FireballFireballProjectile, Spell, AoE, Fire
Level: (1-20)
Cost: (6-25) Mana
Cast Time: 0.75 sec
Critical Strike Chance: 6.00%
Effectiveness of Added Damage: 370%
Projectile Speed: 1040
AoE Radius: 9Unleashes a ball of fire towards a target which explodes, damaging nearby foes.Deals (9-1640) to (14-2460) Fire Damage
25% chance to Ignite enemies
Base radius is (0.9-1.4) metres
Additional Effects From 1-20% Quality:
Base radius is (0.01-0.2) metresPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
and 
Vaal Fireball.
It can be purchased in the shop for 90 points.