Serra (Magic: The Gathering) - On Serra's Realm

On Serra's Realm

After Urza left Serra, the plane was invaded by Phyrexia. Phyrexia was beaten back, but with terrible losses to both sides. The plane was left in shambles and there was no more Serra could do to alleviate the plane from the severe black mana presence that resulted from the Phyrexian invasion. She proposed a massive Exodus to the citizens of her realm which wasn't gladly accepted by Radiant, one of the realm's archangel lieutenants, seeing this move as cowardly. The planeswalker then took those of her willing followers with her and those who followed the proud archangel stayed.

Urza later returned to Serra's plane, only to find it collapsing from Serra's absence and Phyrexian corruption. As the plane was doomed to collapse soon, and Radiant was under heavy influence of Phyrexian spies (known as sleeper agents), Urza rescued as many as he could from the dying plane before collapsing it to power the mana battery for the Weatherlight. Since no other options existed, he presented an ultimatum to Radiant: leave or die. The plane collapsed, with all the remaining inhabitants still inside. It was later revealed that after the Weatherlight was destroyed the plane was released and Serra was restoring it when she met Karona, the false god.