5 Paladin Oath of Devotion
5 Warlock Great Old One - blade pact
2 Fighter

Paladin and Warlock extra attacks stack, so with Action surge that's 9 attacks per turn and you have 8 spell slots to add Smite to those attacks

Rafael is a very easy boss, because he has low saves against poison - and once the poison paralyzes him, all attacks are automated crits

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