How to counter Alchemist, Blue Lilith, and Assassin Banshee combo?

Hit banshee with ffe crucible of pain then take out lillith

For Alchemist/M Lillith/A Banshee - On attack side I would swap out your Prisoner for Warrior Derby with Tranquility Talismans. Her basic will remove most effects and Tranquility will give you a shot at removing PI plus her extra turn chance fires quite often.You can target the M Lillith and Disable her then target the Banshee directly. After Banshee is dead, disable the Magus again and work on the Alchemist.

Prisoner only works really well on AI defense. I find on attack side his benefit is only good for the first turn. His stun has some usefulness but not as useful as some other allies. That still doesn't change my mind about his passive needing to be revised.

Viper set.

I am still having luck using desert guardian. Still using FFE, KP, desert guardian, alchemist on the attack. If you go first, hit lilith with guardian to block passive, then work on the team to exploit weaknesses.