Confession time: for most of this novella, I couldn't remember why I hated this one so much more than all the others. There are sincere emotional moments, Celaena is by and large more bearable, mostly because this remains the only story where an anti-slavery viewpoint is actually woven into the character. The romance is ridiculous, but honestly at this point I handwave ridiculous romance in YA as long as it's not AWFUL romance. Plus, we get actual backstory on Celaena (which is actually sort of a problem: we should have this information in the series, not have to read companion novels for it, but that's a different issue entirely). True, Celaena hated all other women for being women still, so it was getting docked points for that, but except in one specific case it was milder than other novellas.
Then, dear readers, I hit the last chapter.
Remember that one specific case? That case is Lysandra. Those who have read the later books know that Lysandra and Celaena eventually become bosom buds, partly because the novels can't seem to stop commenting on Lysandra's bosom but also because the novels decide that Lysandra feels bad for unspecified behavior and apologizes, and in turn Celaena apologizes for throwing a knife at her head.
I mean I, personally, would find knife hurling an overreaction in response to behavior not involving, say, murder or torture or rape, but these books like to think knife throwing and fire hurling are appropriate responses for mild jabs and appropriate commentary, so whatever. In this novella, we learn about the knife throwing incident.
The knife throwing incident is in response to Lysandra telling Celaena something she already knew, ie that Arobynn used the money Celaena gave him to buy off her indenture from him to pay for Lysandra's 'Bidding' (aka, purchasing the first time Lysandra has sex)(the books' definition of sex is a narrow one, before you ask).
The novella treats this as a 'take that'. Please keep in mind that Lysandra has been raised by Arobynn in a way similar to Celaena without the status of getting to call herself his niece (which indicates to me at least that he was specifically grooming Lysandra, which is supported in the novels themselves). She was also purchased as a small child to be raised that way. Could Celaena not have realized this? I would consider it possible, if we did not in fact know that Celaena is in possession of this information. SO THAT'S GREAT.
Furthermore, the entire sordid affair is treated by Celaena, Arobynn, Sam, Lysandra, AND THE BOOK, as a personal wrong done to Celaena, because Arobynn used the money she paid off her indenture with. Is she upset that he used her money to continue a terrible practice akin if not outright identical to slavery? No. She is upset that he used the money to win Lysandra's Bidding specifically. The quote? "He'd spent her money on a person he knew she hated."
Take a chill pill, Celaena and Novella. Consider for two seconds how traumatizing it must have been for Lysandra to have her virginity bought and 'taken' by her father figure and then maybe consider that you're both tied for The Actual Worst.