Ring of Life is a promo card that will be given out to players that show up to game day locations in February and will likely be made available for sale on the Ascension website at a later date.
From the Card:
Ring of Life
Cost: 4 Runes to acquire
Once per turn, if you have played a Lifebound Hero, gain one Rune.
When Ring of Life enters play, choose a faction. Your heroes of that faction are also Lifebound Heroes.
This card was created as part of an elaborate wedding proposition and later adapted for public distribution.