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Message: <blockquote data-quote="Ancoulainn" data-source="post: 9867485" data-attributes="member: 7056539">Depending on how you look at it.For one, you cannot cast Dissonant Whispers through Improved War Magic because it's not a Wizard spell, so you have to use the Magic Action to do it. That does not mean you can't do it; it just means you can't do it that way.But the second part of Booming Blade does not trigger from Dissonant Whispers because Booming Blade says "If the target willingly moves 5 feet or more before then..." and the movement from Dissonant Whispers is not willing movement according to Jeremy Crawford via Tweet on 4/26/2016. However, it would trigger if/when they then decide to run towards you again to attack you. But they could also decide to stay where Dissonant Whispers took them and attack from range if possible and not trigger the second part of Booming Blade.And finally, it poses the question whether you can cast Booming Blade as an opportunity attack at all because War Caster says "When a creature provokes an Opportunity Attack from you by leaving your reach, you can take a Reaction to cast a spell at the creature rather than making an Opportunity Attack. The spell must have a casting time of one action and must target only that creature." And Booming Blade has a range of self. Fortunately, SAC clarifies this with regards to True Strike which also has a range of self and says " Similarly, unless a special feature allows you to do so, you can’t cast True Strike when making an Opportunity Attack." 2014 SAC said with regards to Booming Blade and Green-Flame Blade "Like other spells, these cantrips require the Cast a Spell action, not the Attack action, and they can’t be used to make an opportunity attack, unless a special feature allows you to do so." That "special feature" is most likely War Caster.</blockquote>

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