I have seen a lot of An-ki Dingir fights posted by JP players using Mariel NS SA mainly due to her Singing buffs, EoT cleanse, and SA Hold Ground. 

With that, I wanted to share that Eleanor without SA works REALLY WELL against this superboss. One Glimmering Claymore already provides PWR and INT -45% (assuming attack again) to mitigate An-ki Dingir's damage. On top of that, prayer provides -40% damage receieved and Sacred Veil provides Magic Resistance +50%. Her moves alone will almost guarantee survival (except when boss uses X-40 and have stacks of Radioactive Decay, typically won't survive after 2nd Death).

Also, as much as possible, equip Eleanor with Confusion Immunity Badge and Power of Ailing Res. Grasta for p/p immunity. Pain and Poison activates at EoT before she uses her EoT prayer, so praying will be cancelled.

The only missing piece from her kit is Hold Ground, so make sure Buoyancy Shield is equipped (recommended on Korobo for non-Thunder teams)

As for the second photo. I just wanted to share that I have given her 2 of my allcosmos since she carried me on 1st and 3rd round of this superboss (will also likely use her for the full malefics). 2nd round, I used wind team so Suzette ACAS did the job for EoT cleanse

Eleanor Vs. An-ki Dingir