The Finnish Phoenix
I beat the Gauntlet 15 times in a row with ChaosWeaver without any trouble. I don't know if Verlyrus? has rules regarding his move pattern but never saw him heal twice in a row, so I focused on killing him within a couple turns.
I used Sir Leon and Artix as guests and Toddler Dragon as my pet with 198 Protection, 1 Magic, 1 Fighting, 200 Mischief, and 200 Assistance, and elementalized to Primal Ice.
My non-weapon equipment was initially Distorted Doom Visage III, Leaf of Flux III, Soulmender's Cloak, Soulforged Ring (Blue), Vaal's Ego, and Leorilla Mane Belt IV but after getting Mage's Challenger Belt V I switched to it. My stats were 49 STR, 200 INT, and 196 LUK to round to the nearest crit point I think while just being very offensive, it's my farming setup in general so Wings of the Unraveler III and Tentacle of the Dominion III might've been more prudent but the all-out offence approach worked well.
Against everything but Verlyrus? I used Veraad III as my weapon with Blade of Awe shown to conserve mana for Verlyrus? if necessary which I don't think it ever was and just spammed Empowered Gambit, Untangled and if that didn't kill them outright then a Toddler Dragon Attack or a Toddler Dragon Skip and Sir Leon Final would.
For Verlyrus? I used Soulforged Scythe (Ice) with Ice Scythe shown
Turn 1: Unempowered Weaken, Toddler Dragon Scales, Sir Leon Defend, and Artix Attack. I saved Artix's Pure in case Verlyrus? healed turn 1. If Ice Scythe's special connected I'd switch to showing Scythe of the Unhallowed V on Turn 2 mostly out of convenience since it was higher up in my inventory but Staff of the Amulet works fine and I like it more. If Ice Scythe's special didn't connect then I'd switch my equipped weapon to Veraad III for turn 2 since I'd be sure to stun and then could still proc Ice Scythe and then switch back to my Ice weapon.
Turn 2: Empowered Gambit+Empowered Soul Shred, Toddler Dragon Boost, Sir Leon War Cry, Artix Pure, for turn 3 I'd switch to Thorn Replica IX since I'd be using my guaranteed crit move
Turn 3: Untangle, Toddler Dragon Primal Fury, Sir Leon Final Attack (this would be ridiculous and often do over 1000 damage at this point), and Artix attack which would finish the job.
Hope that helps!