[@Dawnscroll]
>Mapped land
Ilunabar invented an order of cartographers in the Mesathalassa. Logos...?
>Feast Days
Being brought thanks to the 16 temples Ilunavar created based on combinations of time of day (morning, daytime, sunset, nighttime) X seasons. Logos did...?
>Proper Pantheon
Mortals already have it, but guess who is doing all the anthropological work and will be soon helping mortals to build temples with the help of the GP (grand parade). (Vetros did it on its own, but they are absolute Mahd man)

In fact, instead of trying to imprison/dominate/kill Ilunabar I think Logos should show up and outright apologize and accept that Beauty (Order) is a thing.

Edit: I misunderstood what you meant with Pantheon, but guess what, Ilunabar is also slowly building the most neatly organized group of divines around, granted it's formed by shards of her, by still, the celestial bureaucracy is shaping up.