Its alright, just needs some tweaking to be okay
Firstly, swap the 5 tesla immortals for the 10 gauss immortals, tesla is mathematically better in all cases until the gauss gets into
RF range.
The stalker is good, but its used best to give out its
RR 1's buff to other vehicles (
DDA for example, having D3 shots means you have to make every one count). In a list like this you can use it more aggressively. I almost always run it with the THGC, due to having a superior range it will be safer for longer, as it doesn't have QS so its
substantially more fragile than our other vehicles.
Anni barges are good, when you have lots of other vehicle threats to draw fire away from them, but otherwise they are also fragile, and you only have 2 other vehicles to draw fire away, and realistically only one as noone will care about a
GA, as its buffing a terrible unit in warriors.
This list is
very slow, with all of your main damage coming from the destroyers and lychguard.
Destroyers are okay, but dont think that having 12 wounds on 4 models is good, all that needs to take them down is 4 shots from a
D6 damage weapon, a single devestator squad with lascannons will oneshot this unit. They are actually not that survivable.
Anrakyr is very good with lychguard. Yes he benefits from his own aura, however you are footslogging them, like I said your list is very slow, meaning you will have to face volley after volley of shots before you can start to do damage.
Wraiths are okay, their damage output isnt atrocious but also not amazing, remember its 8th edition now, nothing can be tied up in combat anymore, if you are aggressive with them & charge a unit, you'll do your damage but then they will just fall back and you will be front and centre to receive the shooting wrath of the rest of the army.
Ghost arks are okay, but dont put them near D2 weapons as they will be 1-shot if they have enough shots.
19 warriors are terrible, again you have no way of getting them into
RF range so its an even harder mission to get them to be relevant in the game.
I would personally drop the anni barge, add in a
DDA, swap the heat ray for a THGC on the stalker, drop the destroyers for a Deciever C'tan and more lychguard (using a
CP to try and get at least a 3+ on his redeploy so you can put the 10 lych and anrakyr in cover t1 so they can wait until they can charge t2). I would drop the warriors and
GA completely, make it 3x 10 immortals, w/ 2 with tesla and 1 w/ gauss (if you want to keep a battalion). I would drop the cryptek for an overlord and keep him and szerath with the immortal squads, thats a much more efficient shooting platform.
As always, if you have free points put them in scarabs, they are probably top 3 units in the index
atm, very points efficient for what they offer. Fast, lots of wounds, buckets of attacks.
Deathmarks are like all snipers this edition, look good on paper, almost never perform on the tabletop.