Небо
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"Produced by the dangerous little guy Gunslinger from Gilead"
Here, it's not about the gunslinger himself, but about the "dangerous little guy". I conclude that this refers to the following character
In the last book of the series, Roland and the members of his ka-tet are pursued by the son of the Crimson King and the gunslinger himself, Mordred
The son of two fathers and two mothers, Mordred was born from Suzanne's egg cell, fertilized by both Roland of Gilead and the Crimson King, and preserved by Mia. Mordred is half-human, half-spider, and capable of controlling transformations from one form to another.
Next, we look for clues starting from Mordred.
I haven't guessed the first clue yet, as I don't understand where the clue is there.