Always Save the Girl: Appears to be subverted when it is assumed that Zahara has died, but it then turns out the corpse they thought was hers just belonged to an underfed, girly-looking Imperial cannibal.
And I Must Scream: Pretty much everything that happens once the security team returns from the Star Destroyer. Screaming is also used by the zombies as something of a communicative measure between them.
Apocalypse How: Initially a Type 3, with everyone except the six protagonists either dead or zombified, but then moves into a Type 3A when it turns out the virus was manufactured as a bioweapon by the Empire.
Cover Drop: Characters split up from Zahara and Kale come across two Stormtrooper helmets as they trek through the Star Destroyer, and one of them hangs on a hook as depicted on the cover of the novel.
Driven to Suicide: As the Longo brothers make their way past the quiet prison cells, they see that some of the sick inmates ended their suffering by killing themselves.
Dual Wielding: At one point, Zahara does this with syringes in order to administer an antivirus to an already-zombified victim. It only works temporarily, but she gets a computer password out of him before he turns back.
Eye Scream: Zahara defends herself from a zombified scientist by stabbing him in the with a syringe. The contents of the syringe bring back some of his past intelligence, and he plucks it out of the eye socket and tries to use it as a pen.
Heroic Sacrifice: Sartoris jumps off the lifter used to save Trig, Han and Chewie, down to a hoard of literally thousands of zombies, just so the lifter has enough weight and thrust to escape. It helped that he was slowly being zombified.
The Immune: Implied with all of the main characters. It's a natural occurrence, although less than one in a hundred are immune. However, Zahara makes an antivirus from her blood, just in case.
Infant Immortality: Averted in a very gruesome way when an infant Wookiee is devoured by its parents. It's off-page, but jeez...
Kick the Dog: Trig and Kale find the only escape pod remaining onboard. Just as they are about to enter it they are cornered by Sartoris, who threatens both of them (keeping in mind Trig is merely 13 years old) with a mouthful of blaster bolts if they take the pod. He then uses it to escape himself. First he kills their dad, then he leaves them to die at the hands of the ravenous undead. What a dick.
Meaningful Name: Meta example: The writer is Joe Schreiber- which, incidentally, is archaic German and Yiddish for writer (not in modern German though).
Mercy Kill: Trig is forced to do this to Kale after he becomes a zombie.
No OSHA Compliance: As always for a Star Wars story, there are rail-less catwalks above bottomless chasms in the Star Destroyer. Here, however, the threat of the drop is enough to make Trig seek an alternate route.
No Party Like a Donner Party: This has been happening aboard the Freebird before Sartoris arrived, as Gorrister and his men have been trapped there for over two months, and they have been eating their weaker members to survive. They later try to include him.
No Zombie Cannibals: There are hundreds of hungry zombies prowling between the two large ships, and they are only content with the flesh of the uninfected.
Gorrister: Too bad they can't eat their own.
Non-Human Undead: While different species have their own reactions to the zombie virus (humans start vomiting uncontrollably and Wookies' throats are clogged with liquids to the point of bursting), they all rise from the dead as mindless things looking for living flesh to devour.
Not Using the Zed Word: Averted. Han Solo uses the term once, but it's within the last ten pages after everyone's escaped.
Once Is Not Enough: Subverted. When a zombie is discovered in the escape craft and gets shot, Zahara is smart enough to keep the blaster on it — not that it matters, since when they reach a certain distance from the source of the virus, the zombie dies naturally. Still, points for trying.
Our Zombies Are Different: Oh boy is there ever. Major spoiler alerts ahead: While not necessarily fast, they are by no means slow. Unlike most zombie outbreaks, this one is airborne, and it seems less than 1 in 100 are immune, as in a prison barge with 500 prisoners and an unknown amount of crew, only 4 people are immediately immune. Get bitten and immunity means jack. Shooting them in the head does not kill them. The zombie does not need to have to have died from the virus to reanimate. The fact the virus seems to be SENTIENT, alluding to a virus that is possibly force sensitive. Last, but not least, they LEARN. Oh boy do they learn, seeing as how they go from not knowing how to fire a blaster to deadly accurate within minutes. An antibody can actually be made, preventing you from getting infected from the airborne virus (though possibly immunity from bites as well, we never see someone with the antivirus get bitten). Finally, unlike most outbreaks, if they get too far from the source of the virus, they die.
Saved by Canon: Han Solo and Chewbacca will survive to help Luke Skywalker and others to blow up the the Death Star a year later. Though they do get a taste of horror when Chewie becomes briefly infected by the zombie virus.
Vasquez Always Dies: Rare gender-flipped example: Kale, the more spirited, proactive, generally pretty Badass Longo gets his face half blown off and turned into a zombie; Trig, the more useless, tag-along brother, survives
The Virus: The reason all but six of Purge's occupants become undead. Turns out to be a new bioweapon developed by Imperial R & D that gets way out of hand.