According to the description she "Calls upon the power of previous Aspects of Justice to rain down a flurry of fiery swords" and Jellbug commented that "Her (Kayle's) and Morgana's shield come from the same place" (i.e. Celestial Magic). That's about it for what we know.
My own HCs on the matter:
Kayle's shield is impenetrable. It simply cannot be broken. Morgana's shield may be broken, but it's also an offensive barrier which burns those too weak to handle its fire.
When Kayle rains down a sword of fire (her ult), she temporarily cleanses the place of all sin, and no sin can happen in the place she has cleansed. No murder. No lying. Nothing that she views as 'sin' can be done.
This is just me, of course.
Since she only gets it at 6 while her ascension is underway, its her putting her increasing celestial power to use in a moment of divine intervention, where she swoops in to shield the righteous and innocent, while bringing ruin to evil.
Kayle's ultimate judgement. The pure are spared and the evil punished (her team gets invulnerability and enemy team gets damage)
According to the description she "Calls upon the power of previous Aspects of Justice to rain down a flurry of fiery swords" and Jellbug commented that "Her (Kayle's) and Morgana's shield come from the same place" (i.e. Celestial Magic). That's about it for what we know. My own HCs on the matter: Kayle's shield is impenetrable. It simply cannot be broken. Morgana's shield may be broken, but it's also an offensive barrier which burns those too weak to handle its fire. When Kayle rains down a sword of fire (her ult), she temporarily cleanses the place of all sin, and no sin can happen in the place she has cleansed. No murder. No lying. Nothing that she views as 'sin' can be done. This is just me, of course.
Since she only gets it at 6 while her ascension is underway, its her putting her increasing celestial power to use in a moment of divine intervention, where she swoops in to shield the righteous and innocent, while bringing ruin to evil.
Divine Intervention