I mostly used Vhala, Carina and Hilstara. Not the most optimized party seemingly, by the end, Vhala kind of died a lot.
Decanter Coming from me, it doesn't mean much, but I don't think it's really worth it to heal the Toxin status, it's better to soldier on in my opinion. Simon and Carina with their support and healing.
If I remember correctly, Lilith is weak against Simon's Dominate.