@JamesK is right, the full quote reveals a different meaning:
That night in bed, I thought of the way dappled sunlight had danced in Soraya's eyes, and of the delicate hollows above her collarbone.
The person thought of two separate things, both related to Soraya’s physical appearance (and only one related to sunlight).
Dappled sunlight dancing in her ...
The normal rule is: If you add "-er" to a word that ends in "y", then if the letter before the "y" is a consonant, change the "y" to an "i" before adding the "er". If the preceding letter is a vowel, leave the "y" as is.
Thus, try -> trier and amplify -> amplifier, but assay -> ...
"Soul", in the sense if the "spiritual aspect of a person that survives death" is usually a countable noun.
Three souls ascended to heaven.
In figurative uses it also usually countable:
It was a place without a soul.
The genre of music is non-countable, "Soul was popular in Northern England"
Don't confuse with the adjective &...
Its a joke, specific to that show. In the show, expression in English that use the word "God" are changed to use the word "glob".
The word "glob" sounds like "god". In fact, in the show there is a god-like being called Grob Gob Glob Grod
It's not used outside to the context of Adventure Time.