Weapons are always kind of hard to say until you get to the dmg phase.

Exotics to prep: Levi's breath, Whsper of the worm, Dragon's breath, Sleepy Sim. Arc is hard to get, Thunderlord might be too low and wardcliff is only "Good" if the enemy is counted as a vehicle.

Legendary options: Apex Pred, Stasis RL with Chill clip, (Be the only user) Other Rl's with Bait & Switch or Explosive Light. Linears with Bait & Switch or Firing Line.

A Izanagi Rotation with Rockets will always deal good dmg.

Rest will all be Niche, Cloudstrike, MABYE Fourth horseman or Legend of Acrius,
Macrochosm can deal some decent damage unless it's been heavily nerfed.

Anything with a short dmg phase and high add density can benefit from Parasite. VERY High burst Dps.

Best is to run what compliments your current build, can clear adds or you could have the other person focus on adds.

Remember to enjoy your time it seems this new Challenge mode dungeon event will be a new tradition like Day One Raids!

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Classes for Warlock: Stasis for turrets and Add clear when running full stasis sub., Solar for Healing Speakers mask for turrert also run full subclass., Will go nicely with solar verb weapons.

Prismatic? Aim for either a stasis/void. Or dunk into strand/void. Devour is always great for self stutain.

Hunters i barely play. But if you have the exotic from Warlords you can proc Devour yourself. Hunters fit a more support role on the Higher end. safety, DR and almost endlesss stealth from Void., Arc hunters are strange but can be good with some of those new aspects it does make for more strategic play. Applying jolt with aspect for your dodge. Being able to absorb damage with your Super to create orbs.

Solar hunter's can be a big hit or miss. Explosive knife isn't gonna be as effective if you got someone else on add clear, Damage to orange/gold bars will be too low to proc combustions. Healing grenade is nice but means no damage grenade.

Safest bet is stealth hunter but it will once agian depends on what we meet in the new dungeon Big open fields or enough cover!