Rudra fulfilled his promise to Ruby by marrying her in vanaheim 3 days before his real life wedding with Naomi.
Despite the protest from his mother and Neatwit , Rudra knew for a fact that because he fell in love with Ruby first and Naomi later, the first one to be married would be Ruby and only then Naomi.
With Omega coming to an end and the future life of him and Ruby and uncertainty, Rudra knew that he needed to marry her for as long as possible for nobody else but himself.
Initially it was supposed to be a grand affair, however with him not wanting to disrupt the training routine of the elites even for a single day, he decided to do it under wraps by only inviting the people closest to him.
Karna was his best man at the wedding and it was held in the church of light in vanaheim with royalties from various kingdom including Emperor Cervantez attending.