CREATE TABLE table_28714 ("Monarch" TEXT, "Heir" TEXT, "Status" TEXT, "Relationship to Monarch" TEXT, "Became heir; reason" TEXT, "Ceased to be heir; reason" TEXT, "Next in succession" TEXT)

Who was the heir when the monarch was Wareru?
SELECT "Heir" FROM table_28714 WHERE "Monarch" = 'Wareru'
SELECT "Heir" FROM "table_28714" WHERE "Monarch" = 'Wareru'