Do we know what it is? Is it related to the succession battle?
We don't know what it is.
A very rough summary of the chapter:
Bonolenov:
- Finds Hisoka due to Chrollo's prediction on where he would be. Admits that Hisoka is a bad matchup for him since it's impossible for him to dodge Hisoka's nen (Bungee Gum) while transforming.
- One of his nen abilities, "Metamorphose" (could be wrong since the furigana is pretty blurry), lets him copy a human he talked to in person. The transformation lasts around the same amount of time he spent conversing with them. It has no restrictions in terms of the size of the person he'll transform into (whether they're Kalluto-sized or Uvogin-sized), but he believes that it feels like it lasts shorter depending on how much shorter the person he transforms into is compared to his actual height.
- He killed Lynch because she got angry at the Spiders, and he tries to think about what consequences it might have in case someone finds her dead body, like Hisoka getting kicked out of the higher tiers (which would make it harder to find him).
- Says he prefers to leave Hisoka to Phinks' group since Chrollo's not in his right mind due to Shalnark and Kortopi's deaths, and that the "treasure" that Chrollo is looking for in the ship is actually someone (or their ability?) that would 100% kill Hisoka.
- Says that the reason why Chrollo left the number 9 open was because Chrollo intends to "end the play" with Hisoka. As in possibly ending the Spiders (which was created for Sarasa) with Hisoka's death.
The scene right after that shows news about Sarasa's murderer, being called the founding chairman of a group for children who weren't blessed ("Mama Help" from the furigana). The news states that he was slaughtered 10 years ago and the murderers are still not caught (they're pretty obviously the Troupe).
Nobunaga:
- Asks if Heil-Ly is "actually Heil-Ly" since their actions are unlike those of other mafia groups where they're "destroying everything" instead of just enemies (Nobunaga and co basically figured out Morena's main goal and how her powers work *roughly*).
- Says that Heil-Ly might be pretty similar to the Troupe in terms of how they operate.
- Tajao says that they're messed up in the head; Phinks assumes that he was talking about Heil-Ly, but Tajao was also referring to them since they managed to think of that.
- Tajao offers Cha-R's complete help in exchange for the Troupe destroying Heil-Ly.
- Nobunaga states that they'll go first; Phinks asks Wang to tell the other Troupe members and Hinrigh.
Wang seems to be some sort of ally to Morena since he worries that Nobunaga and co might reach her earlier than expected. He mentions "Joker," either referring to the card "joker," possibly meaning a trump card, or Joker as in making use of Hisoka.
Dogman went from level 36 to 62. Morena orders him to go to Halkenburg's funeral, calling it an ideal opportunity for something due to the number of people who would be gathered there. It seems like he's tasked with finding someone or something with his smelling ability (maybe Hisoka or possibly Halkenburg?) to recruit them.
Dogman asks how he'd tell Sodom once he finds the "target." Sodom says that as long as Dogman points at them, he'll take care of the rest. Sodom reveals that his ability's condition activates if the target hasn't learned nen (or a nen ability?) yet (so it most likely isn't Hisoka), confidently saying that he'd be able to bring the target back on his own.
Morena says that the three guys whom Hinrigh beat plan on taking revenge, so they leveled up to around level 51 in the processing plant.
Back to Nobunaga's group, Tajao warns them that the place they're about to enter is about to get "rough," possibly due to dead bodies.
Editor's note: Hisoka and the Troupe start to move (possibly indicating that they'll clash very soon).