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Message: <blockquote data-quote="Levistus's_Leviathan" data-source="post: 8138895" data-attributes="member: 7023887">The Bladesinger can cast a cantrip as part of the Attack action, instead of the Cast a Spell action. It works RAW, same as this combo. Two-Weapon Fighting requires you to take the attack action, so if you do that with your Hasted action and Cast a Spell with your first action, you still get a bonus action attack if you are dual wielding. We currently have no comment from Jeremy Crawford on whether this was RAI, so there's no reason to suspect that this was or was not RAI. I don't think they specifically were trying to allow this combo RAW, because the game designers aren't very good at finding exploits in the game's mechanics, but unless JC comes and explicitly says "you should not allow this combo at your game" or they make an errata or Sage Advice to get rid of this combination, I'll allow it. It's RAW, after all, and requires you to concentrate on a spell. It's not the same thing, as there is no feature that allows you to do Hunter's Mark as part of the same attack, and doesn't grant you extra actions. Extra Attack grants you an extra action, which you can use to Attack, while the Bladesinger's Extra Attack lets them replace an attack with a cantrip. You still have to fulfill the requirement of "one weapon attack" from Haste, which is why you're restricted to GFB and BB. It's really very simple. Because those would be actions not allowed in the spell's description. A cantrip cast as part of the Attack action is the Attack action (which is allowed by Haste), not the Casting a Spell action.(As long as an ally has the Haste up, that is.)That is correct, and it is because Shadow Blade lets you take the Attack action with it (unlike Flame Blade, for some unknown and probably idiotic reason). Doesn't have much to do with the current discussion, as we all know that the Attack action is not the same as the Cast a Spell action. Specific beats general. The general rule is that you can't take the Cast a Spell action from the Hasted action, but the Hasted action allows you to Attack. The BS's EA lets you replace an attack with a cantrip as part of the Attack action, so the combo works. The key fits the whole. I don't believe they designed the Bladesinger's Extra Attack feature specifically to allow this combo, but as they currently have said nothing on the matter, there isn't any sign that they do not want this combination to be viable.</blockquote>

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