Firefish

"'How can this possibly exist?'"

Proverbs
Proverb Firefish #1 Firefish swim swift as Pan, trying to avoid your flan

Proverb Firefish #2 On goddess Day only, in stillest ponds, do Firefish wake and dart along

Proverb Firefish #3 Take heed throwing a Firefish pie, they explode and you may die!

Location
As of Jan 23, 2020 the Firefish location does NOT seem to follow the Proverbs. It can be caught in Spring, Day 10 (3rd day of the week), in Rivermoor. At the first pond you see when entering from North Gate, just north of the entrance to Rivermoor. There may be other locations as well.