Rebirth
Rebirth is a special ability of Phoenixes. It causes a certain amount of them to "rise from the ashes", if the stack dies. However, the ability works only once per combat per stack. The ability is similar to Resurrection spell.
There is an additive 20% chance for a Phoenix to be resurrected for each Phoenix in the stack. For instance, one Phoenix will have a 20% chance of resurrecting a Phoenix, 4 Phoenixes will have an 80% chance of resurrecting a Phoenix, 7 Phoenixes will always resurrect one Phoenix, with a 40% chance of resurrecting a second, and so on.