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This question is asking if my coup de grace manoeuvre action-sequence, that could only be pulled off once per long rest, is working as intended. I'll try to keep what I am trying to do as simple as possible.

In this scenario, I am a level 5 sorcerer and level 2 paladin.

Round one; cast haste on self.

Round two; try to hit target with longsword casting green flame blade, and expending a level 3 spell slot for divine smite, then follow up with a second attack using my 2nd lvl 3 level spell slot for a 2nd divine smite, but with my bonus action stop concentrating on haste, and cast thunderous smite as a bonus action, landing the hit for a total of: 1d8+2+4d8+1d6+1d8+2+4d8+2d6.

For the sake of this question, let's assume I have all of my spell slots unused.

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Round 1 - Cast Haste - no issue, here. Though you could squeeze in one more attack (possible Divine Smite-ed) after casting.

Round 2.1 - Cast Green Flame Blade, on a hit, use Divine Smite - Divine Smite only needs you to hit with a melee weapon attack, which GFB does. No problem.

Round 2.2 - Hasted attack with Divine Smite - Pretty standard.

Round 2.3 - Cast Thunderous Smite and hit - Nope! You can only cast Thunderous Smite, but you can't attack anymore- having expended all your attacks. You already attacked with your Hasted attack. You can't Two-weapon fight either, because Thunderous Smite is a Bonus Action.

TL;DR- Everything is legal, but you can't attack after using Thunderous Smite.

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No, this is not possible.

On round two, you don't need to use a bonus action to stop concentrating on haste, because dropping concentration is free. If you did stop concentrating on haste, you will lose this current turn and feel lethargic, unable to take the rest of your turn and your next turn per the spell description.

This means when you cast thunderous smite, you will be unable to take your actions to attack/cast spells. Thunderous smite only works as a buff, it doesn't let you also attack with the casting, so to use Thunderous smite, you would have to cast it before GFB/your 2nd attack.

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