Talk:SE.RA.PH/@comment-28605611-20170507194458/@comment-182.30.65.130-20170508004337

I'm pretty sure it's similar to the challenge quest reruns in events in that they're only there to test out different teamcomps and boss setups or challenge harder versions for bragging rights. It doesn't count for the "clear all quests in the near/front side" mission, and it specifically states that there's no rewards for finishing it.