Rak Tulkhesh

Undefeated Champion of the Onyx Octagon in the cityofbrass.
Overlord of Battlefield of Avernus in the Blood War.
Personal Guard of Asmodeus.
Devil (due to my backstory, even tho originally a fiend).

Fights party with 8-1 odds at 50k gold bet.

Their plan

Potion of heroism plan.
But no potions before battle!
Wall of Force protection
Holy Weapon (+2d8)
Potion of Speed (bonus action to drink)
Mind Shielding?
Globe of Invuln (wont work against weapoons)
NB: he can dispel in round 3 to end magic.

Strategy

Defense

23 AC, 25 ranged AC, crazy speed, 80ft fly. Crazy Saves.
Res cold/fire/lightning.
Immunity: poison.

Attacking

+17 to hit, max AC 24 => 7 hits everything.
Actually only hit cloaked GW with cloak 50% chance as (14/20)^2
Can miss 20AC people with 10% chance (1or2).

Infuse one smite per round (but he has limited smites).
- Blinding is great. He needs to fail a con save to loose it.
"see one weapon glow brighter and brighter as it rushes towards and impales your chest, make a CON save"
- Banishing is crazy good. Also concentration, but they need to break it with one less. Save it for last. It's potentially a Deus Ex Machina.
- Staggering is whatever. Throw it in there to confuse them.

Legendaries

3 Attacks

Most DPS, but might not hit due to potions. Throw in crazy crits if too easy.
Damage == 28 => crit dmg == 66. Just roll them in the channel.
expected damage on 4 hits is 112 dmg.
on gw it is 56, but that rises after dispel.
with 4 hits + legendary hit => 140dmg round.
probably like 70-80 per round on GW after debuff.
they are fucked if he disables him.

Debuff + Extra Attack

Dispel legendary removes Spell effects from activated potions.
- Potion of Speed (effect of haste spell)
- Potion of Heroism (bless pell only, not temp hp)

Homebrew: Cast Action Spell (2 actions)

Spirit guardians. Sword themed guardians. Do it as an enrage if all smites have failed.

Provoke Rage

DC24 WIS SAVE vs reaction against closet creature. Everyone. Mostly just annoying for people in the back as they end up throwing weapons.

Banishing Smite

Can trigger disqualification if concentration is not broken. They have one minute. They can maybe run down the clock while the announcers tell them this.

Extra Plan

Compel Duel Paladin. Probably not useful.
Blink.
RING OF WISH!

wish for a massive rock to flatten the arena while they are invulnerable
would have to pay for damages