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(Spoilers act 3) Can we talk about how good his song was?
(startrek.website)
When this song started I was so shocked. What an epic fight song for an epic fight that only took me 4 hours to beat. This game continues to amaze me.
It really is the best boss fight of game. Raphael is channeling his inner Disney villain in full.
I finally finished him solo in one round two nights ago. He was the single hardest enemy to achieve this against.
Please tell me how the fuck you did that. You did 666 points of damage in one round??
Swords Bard 7/Thief 3/Fighter 2 with this build and items. I just used the Helmet of Arcane Acuity instead of the Helmet of Grit. I coated my weapon with Purple Worm Poison and activated Phalar Aluve's Scream prior to clicking on the gate. I also ascended my tadpole in Creche Y'llek.
I started by making one attack with an Arrow of Many Targets against Raphael positioned such that the arrow ricochets into Korrilla, this shot will need Sharpshooter turned off to increase hit rate for the Luck of the Far Realms + Surgeon's Amulet instant Paralyze. This will also net 4-7 stacks of Arcane Acuity which will also boost the DC of your Illithid Abilities. Next I drop Perilous Stakes which with the boost from AA will have a 70-80% success rate. Now I just lay into Raphael with Sharpshooter/Ranged Slashing Flourish attacks from within 3 meters for instant Crits while reserving a single shot for Korrilla to activate the Elixir of Bloodlust. Use a Bonus Action to apply a Potion of Speed and Action Surge as needed. I actually had 3 attacks left over at the end to eliminate one of the Cambions and cleaned up the rest Round 2.
It's not too difficult to do with some of the broken builds and items. Monk/Rogue can do it, as can GWM Sorlockadin and throwing Barb/Rogue.
Then of course there's the goomba stomp monk but you're gonna be there forever.
The main issue with all of the builds you've called out is consistency. All but Goomba Stomp have a damage cap of 450-490 without debuffing Raphael and I've never been able to get better than a 55% chance on Perilous Stakes with a Melee build. They just can't build Arcane Acuity charges fast enough to overcome his save modifiers even with Shriek. All of them can 2 round no problem. It's cramming buffing and debuffing into the first round where you run into the difficulty. I've tried them for the fight and watched youtube vids, and they just can't get better than 55% for a solo one round.
While Goomba Stomp doesn't have a damage cap what it's most effective at is dealing psychic damage to the player. I tried it on Karlach my first run and I only lasted 1/2 a long rest before respecing.