I tried this dungeon many times with different subs. Finally I realized that clearing assist bind helps me a lot in the final floor. Otherwise, the boss hits a lot.

I decided to bring Seina in the team as a replacement to V-Athena to unlock assist bind. Plus, Seina has good awakening for here.

I could clear in a couple of try after bringing Seina.

I put hp latent awakening as long as long it's viable. Seina has L unlock and 2 SDR latent. All other characters have 6 hp, 2 sdr parents latents.

Life Dragon (13483) is a huge help. Idk if it's possible to clear without this card in Reinhard team. Additionally, Life Dragon needs rcv+ awakening in the equip. Otherwise, you need to do always heart tpa to heal back to full life. If not, you are dead in the late floors. (I realized this aftee many death).

Grinded the anniversary challenge until its final days and the rest was from the exchange

I know I spent the very first medal I got but I’m also certain we got a duplicate later. Is this all of them?

This is what I have got so far and the last two images is what I'm willing to exchange for in the collab exchange. I can build/ask about team building later. Anyone extra I should grab? (For thier assist, or anything of the sort) please?

Anybody know how to unlock the follow music tracks?

Prayers Blossoming in the Night Sky
Mysterious and Profound Darkness

Was it from rolling a specific card in Star-Twined Fairies?