Foam


 * "Reduce foes' Agility with tidal disturbance."

Location
Foam is found by random encounter in the overworld after the Grave Eclipse. Go southwest of Tonfon and fight in a forested area under some mountains in the darkness until you fight and earn it.

Foam's Djinn Guide entry is as follows:
 * "This spirit of churning oceans is first met near Tonfon. Foam can create areas of tidal instability that slow enemies down."