Bubble Ring is a Water-elemental skill in Epic Battle Fantasy 5 used by foes and available to players through the special effects of equipment. In the v2 update, it became a shared skill learnable by all players.
When cast, a ring of blue bubbles appears in front of the target, the bubbles then shoot forward, converging on the target. This deals Water-elemental damage that scales depending on the user's higher offensive stat and inflicts Syphon.
Bubble Ring is a pretty flexible spell that can be used both for offence as a source of Water-elemental damage, or for utility as a source of Syphon.