Froth Psynergy series

Froth, Froth Sphere, and Froth Spiral are a series of Mercury attack Psynergy featured in both games. It is available to the Medium class series and the Seer (Mercury) Class series. All Mercury Adepts, and Jupiter Adepts can become members of the Medium class in the first game, while in the second game Venus Adepts could become members as well. The Seer is available to Mercury and Venus Adepts meaning that all Adepts except for Mars Adepts could potentially use this series. The Froth Series is believed to be the equivalent of the Thorn Psynergy series.



Psynergy spells
Froth: This costs 5 Psynergy Points, has a base power of 28, and has a range of three targets. It is available at level 2.

Froth Sphere: This costs 12 Psynergy Points, has a base power of 65, and has a range of five targets. It is available at level 14.

Froth Spiral: This costs 31 Psynergy Points, has a base power of 150, and has a range of five targets. It is available at level 40.

Analysis
If the player desires to use the relevant classes to obtain this Psynergy series, then using this move becomes very viable, as it is the heaviest multi-target Psynergy available. However, one would first have to set getting these classes as an objective, as these classes are not particularly useful in their own right, as they mean that the Adept will not maximise their Elemental Power, meaning they can't fully utilise the class's boosts to PP (as they will have to cast more to do the same damage). Furthermore, the large requirement of Venus Djinn means that other classes potentially become unavailable, such as the powerful Brute class series, which may be an impediment. Naturally, this depends on the player's specific party composition and objectives.

Enemy uses
Like many psynergies useable by Isaac and Felix's party, Froth is also used by enemies and monsters. The following opponents can use psynergy spells from the Froth series:

Hydros Statue - Uses Froth Sphere. It used 53 out of 256 times.

Siren - Uses Froth. It is used 2 out of 8 times.

Sleet (Mercury Djinni) - It uses Froth Sphere.

Spritz (Mercury Djinni) - It uses Froth Sphere.

Hail (Mercury Djinni) - It uses Froth Sphere.

Dew (Mercury Djinni) - It uses Froth Sphere.

Fog (Mercury Djinni) - It uses Froth.

Sour (Mercury Djinni) - It uses Froth.

Steam (Mercury Djinni) - It uses Froth Sphere.

Eddy (Mercury Djinni) - It uses Froth Spiral.

Balm (Mercury Djinni) - It uses Froth Spiral.

Serac (Mercury Djinni) - It uses Froth Spiral.