Resized to 68% of original (view original)
Artist's commentary
You will come into me, Sessyoin
A celestial paradise, a warm maw to consume all things
... Deliver yourself back to the cosmos
Kiara-san came in a lucky bag, I'm really happy
The second image is an older picture of Kiara-san with a different look
Translated to the official localization of her Noble Phantasm Chant in FGO. Artist is reffering to the Pixiv post.