It feels like having wings, unable to unhinge. This rune is shaped like one and provides complete protection for Unbalances, which are caused by a lot of Unite Attacks and some command runes as well.
While useful, keep in mind that this effect is merely a subset of the full status protection granted by the Turtle Rune. However this is so far only relevant in Suikoden V where both runes are present.
In the majority of games, the Balance Rune is an unusual item, looted from enemies or found rarely in a treasure chest. Suikoden Tactics on the other hand uses the rune as a common tool taking part in several battle tactics and thus sold in shops. - Celes