
Fun card that requires a little help.
Segment of Onyx is fun and powerful, but not without the right tech. You need drawpower to find it, or tutors, and you need deckspace. It's actually quite costly at 3 resources to "complete".
For a full on this card will probably pull it's weight, Preposterous Sketches, Cryptic Research, Mr. "Rook" and Glimpse the Unthinkable make actually finding the things relatively easy, Feed the Mind will find it in a jiffy! For a full-seeker there is one problem though, 3 slots might be very hard to come by! Segment of Onyx competes HARD with the classic "research" cards, Strange Solution and Archaic Glyphs, if it's not pushing those out then it's competing with powerful mechanics like "I've got a plan!", Pathfinder or Connect the Dots. Don't forget that Segment of Onyx also needs support to find them with.
For a non the prerequisite for card support is harder, there are no Glimpse the Unthinkable, Cryptic Research for them and Mr. "Rook" charges might very well be better spent on other things (finding weapons, useful skill cards in the moment). If you get Segment of Onyx then you should probably also be getting Preposterous Sketches ASAP. Feeling like you HAVE to tutor fragments can actually get in your way and until you complete the damn thing the early shards will feel like duds.
I dont think I really need to talk about how powerful this thing is when you complete it, crazy movement efficiency, evasion and unstoppable clue gathering make it rather awesome, Pendant of the Queen is perhaps one of the single strongest items in the game. It's particularly interesting to multi-role characters like Roland Banks and Joe Diamond since they can make full use of every facet of the card, it's also rather attractive for Daisy Walker who can assemble it with Old Book of Lore and she can use Recharge and Enraptured to get extra uses from it. Minh Thi Phan will be a natural fit, she runs through a deck at rapid speed and the flexible uses are of particular interest to her.