Everfrost herb

The Everfrost herb is a plant from the novel The Langya List (introduced chapter 164 of the webnovel), and the show Nirvana in Fire.

This extremely rare plant is rumoured to be a cure for the Frostfire Poison. Nie Duo brings some to Su Residence in the hopes of curing Mei Changsu. Lin Chen refines it into the Everfrost pill.

Adaptations
It is mentioned in episode 51 and episode 54 of the show. Wei Zheng is the one to bring it to Jinling.