Vedek Kira is the development of DRGIII, whose love for DS9 is well-attested, and whose prior works for the series, most of all Cathedral...
Not "Cathedral". David R George III's installment was "Twilight" in the "Mission Gamma" four-parter.
Sorry, title wrong, but not the wonderful 1000 pages of text (or thereabouts), and shockingly good characterization of everyone involved in the run up to going into the GQ.
(I googled Cathedral now, I didn't like its GQ plot that much actually. I was confused, thought the pocket on the planet was the cathedral, not that dull retrogressive singularity)
				
, but it was an O-K read I guess. I go into any story line involving the creepy cyborg-monsters who can't die, the Daleks--sorry, "The Borg" 
--with intense skepticism, and so the origins tell was quite suprisingly compelling. [Spoil]I thought it was a bit of a middle finger to her dead comrades for Erika Hernandez to just admit she was Caeliar and that was fine, but whatever. To say nothing of the billions of drones who (seemingly) aren't going back home to their families even if they could. [/Spoil]