Belle Poppy Resources A material used for Resonator Ascension.

Once the symbol of the Port City of Guixu, it nearly went extinct when Incinero Petals were rampant. However, at the outskirts of the city ruins, Belle Poppy was found to bloom still at its home, having endured the disaster.
Sources
Overworld Collection
Collection Spots
Sea of Flames
Shifang Pharmacy