Welcome to the side of the true dragon...
Cryx are one of the most flexible armies, but also one the most expensive. Almost every unit is a strong and viable asset to our list building with only some units being favored by certain casters.
Casters: If you're new Denegrah1 (pDenny), Skarre1 (pSkarre) and Lich Lord Aspyxious (pGaspy) are you bread and butter guys determining on where you want to go.
The first, pDenny, is probably the most powerful battle box caster. Her spell line up means that pretty much any unit can become a powerhouse dude to crippling grasp or parasite. Add on her feat and she's not only buffing your entire army for a turn, but ruining your opponents turn! She's stealth, so outside of a few units (or all of Legion!), she's safe getting into the fray. Leverage her super fast arc nodes to setup caster kills or apply pressure from multiple fronts. Your slayer is a "clean up" piece, not a front line battle engine. Cryx jacks all have glass jaws to match their glass cannon archetype, so be mindful when you send them in. The Slayer in the battle box should either be used as a counter punch or a bait unit.
Banes +
UA + Tartarsauce is a great start. That's a heavy lifting unit, for certain. The Warwitch Siren is good for harassing and power boosting your "out of control area" arc nodes to zip around.
Other tool kit units and recommended buys:
Bane Knights: Thralls bigger brothers. A must have tool that even I'm lacking.
Blood Witches + Hag: You buy it for the hag, but get some descent anti-infantry to go along with her
Blood Raiders + UA + Captain: The board controlling speed-bump/lock down unit for Cryx. SUPER DUPER Fast. Both Witches and Raiders are a must with Skarre,
IMO
Pistol Wraiths: Who needs to kill their big heavies when you can just make them slump around the battlefield? Deathchill is amazing. Run them for rear arc activation for even more fun.
Nightmare: Synergies with pDenny and
eDenny for a stealth, heavy hitter with neat tricks.
Deathjack: Good friends with pGaspy and
eGaspy, but anyone can run him well since he's so efficient.
The Withershadow Combine: The Cryx Toolbox unit. Learn to leverage their buffs to both the caster and units, but don't be afraid to get them dirty with Dark Industries. If you use them a lot in a jack heavy meta, consider purchasing a Harrower/Leviathan kit or a Seether to pop out for free! I've been playing Cryx for only a short time, but have already gotten 4 free Seethers, much to my opponents dismay!
Skarlock Thrall: Great for aiding casters who need all the Focus (pDenny,
eDenny,
eGaspy)
Bile Thralls: Bombs AWAY! Good friends to all, but
eGaspy loves them with Excarnate!
Unless you love Jacks and gotta have them, usually you don't need them outside of Arc Nodes and maybe a heavy hitter (Nightmare, Deathjack). Cryx love dude spam. If you want that to the maximum, you can get Lich Lord Terminus + Banes + Banes + Mechanithralls + Necrosurgeons... There are a lot of options still to go.
Here are my lists for example:
I still have to buy chunks of
eGaspy's list as I kinda bought stuff willy nilly. If I was running them together at a tournament, I'd keep the Combine with pDenny and put in Durragh + Machine Wraith with
eGaspy.