Bubble Blast inflicts magical Water damage to all foes or players, also having a chance to inflict Wet status while lowering a certain stat. Its animation and associated debuff have changed between its two appearances so far.
In EBF4, numerous blue pulses appear over the targets, bombarding them with bubbles. This has a small chance to debuff Attack in addition to damaging and wetting the targets.
In EBF5, Bubble Blast's animation was changed to a swirl of water that forms a large bubble, which floats amid the targets for a second before popping explosively. This hits twice and may debuff Evade in addition to its usual effects.
Epic Battle Fantasy 4
Epic Battle Fantasy 5
Bubble Blast is unlocked when Natalie joins the party