During a regular vanguard ops a matchmade team and I made it to sedia the boss, and did enough damage until her immunity overshield was up. However, it was completely immune to relic damage as well; we eventually wiped and that fixed the immunity issue of her damage shield. Then she spawned in the taken gyre and was completely unable to float; eventually, the gyre pushed her out and into the ascendant void causing her to respawn. Now, she was able to float so long as she didn’t get hit by the gyre’s debris but if she did we’d have to wait for her to respawn again.