you need to craft spectral sirup. you can learn how to craft heat occisia from othra, then return home make a spectral sirup.
recipes:
Berry Pulps (blue green red black yellow white): any berry with same color
Heat Ocissia: slot 1: angel leaf, slot 2: pulp red and slot 5 water lilly
Spectral Sirup : slot 1: pulp (blue), slot 2: heat occisia, slot 3: pulp (red), slot 4: heat occisia and slot 5: pulp (blue)
after you're done with the sirup, gave it to berny and wait for couple of days. i forgot how long.