Okay.. Primordials MIGHT help a bit with the casting of silver debuffs.

Eternals will help block damage. The other's to be honest.. meh.. most won't do much without more powerful talismans on other characters. Although Valors can be good for removing yellow buffs on enemies.

Ferryman would be a good call... can't take damage and will inflict doom. (Eclipse could go here, but he doesn't really need much damage blocking. Just needs protection against passive disable.

Then I'd look for a toon to remove buffs, specifically Immunity/Perfect Immunity. That's where Valors may help. Maybe Alex with Valors or Charlotte. Although Charlotte can be an easy kill with Valors.

Then blocker maybe.. M Lilith.. But M Lilith without Destiny or a blocker talisman isn't THAT effective any more. Maybe WUR with Steel talismans.

And a healer.. S Werewolf can be good here. He revives and heals.

Truth is new dungeons will be difficult without newer characters and especially talismans. Seems they create these specifically with things like Orbit Talismans in mind. But it all scales based on relics.. so my difficulty won't be the same as yours.