The Shattering

Destroy target land. Star of Extinction deals
20 damage to each creature and each
planeswalker.
"The Night of Black Knives became the catalyst
for the ensuing Shattering.In response to Godwyn's
death, his mother, Queen Marika the Eternal,
shattered the Elden Ring using her hammer, after
which Radagon, Marika's consort and second Elden
Lord, attempted to repair it using the same hammer
but was unsuccessful."