Bang is a spell in the Dragon Quest series. Introduced in Dragon Quest III, it pulverizes all targets with a forceful explosion. It is related to the stronger spells Boom, Kaboom, and Kaboomle, each subsequent spell increasing the intensity of the expulsion until the very earth beneath the foes is razed by the blast.
Bang makes it's debut appearance dealing 16~24 damage and costs 5 mp to cast. It is learned by Magi and Sages at level 11, and by the Hero at level 13.
Bang is learned by Maya at level 12. it costs 5 mp to cast and hits enemies for 20~30 points of damage.
As in the previous game, Bang hits all enemies for 20~30 damage and costs 5 mp to cast.
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Milly learns this spell at level 15, and is the only party member to obtain it. It hits all enemies for 5 mp, and deals between 20~30 damage.
Melvin already knows Bang when he joins the party. It costs 5 MP to cast, and hits between 20~30 points of damage. Maribel learns the spell at Level 9 in the Nintendo 3DS version of the game. The spell is also known to Zev.
Bang is learned by Jessica at level 14. It deals 16~24 base damage, and caps at 36~45 once her wisdom reaches 100.
Bang is available to Magi at level 11 and Sages at level 8. It costs 5 MP to cast, and deals 15~30 base damage. Once the caster's magical might surpasses 65, the spell will slowly grow in power and cap off at 70~80 once the stat reaches 999.
Bang is learned by monsters beginning at level 4 if the monster has at least 13 MP and 26 Intelligence. It is learned naturally by Blackmar, Arc Demon, Balzak, Baramos, Endentured Servant, Ram Horn, Hargon, Liquid Metal Slime, and Nimzo. 
Monsters finally learn to cast the spell in VI, and it deals 15~20 damage. The spell would be forgotten in VIII and return in IX where it deals 15~25 damage.