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Stellaris Dev Diary #380 - Defenders in the Stars

Hi, it’s Alfray once again and I’d like to introduce you to our latest megastructure, the Deep Space Citadel. This three stage mid-game megastructure is a powerful defensive bastion and converts into a starbase upon completion, much like an orbital ring.

Multi-stage defenses

The three stages of the Deep Space Citadel

Unlike orbital rings and regular starbases, Deep Space Citadels can be placed far more freely within a system, provided they aren’t too close to a gravity well (or each other).

The Deep Space Citadel technology is a Tier 3 Military Theory technology which unlocks all three stages of the megastructure and an initial limit of one per system.

Technology!



This system limit can be further increased by the Mega-Engineering, the Starlit Citadel origin and the Eternal Vigilance ascension perks.

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Choosing to build a DSC opens another menu allowing you to select the design.


Once a DSC design has been selected, you’ll be able to choose where in the system it can be placed, provided it’s within the system’s main gravity well. This allows you to choose if you want to defend a choke point or a critical planet.


Nope, that's too close

No, build an Arc Furnace on the molten world, not the DSC!

We will defend our home!

Defending the Sol-Alpha Centauri hyperlane breach point sounds like a good idea.

As the Deep Space Citadel is upgraded from one stage to the next, it gains successively more L-slot turrets, hangar bays and defensive utilities. The final stage of the DSC also gains access to both a single XL-slot turret and an aura slot capable of equipping auras from both titans and juggernauts. Additionally, to compensate for the lack of module slots on the DSC, it has a special module slot in the ship designer capable of equipping most starbase auras and a few unique DSC auras.

Shoot me!

Think of it as a giant “SHOOT ME!” sign.


Custom components

Defensive countermeasures tailored to your enemy

DSC I Design


DSC I Details


DSC II Design


DSC II Details


DSC III Design



DSC III Details


As shown, each stage on the Deep Space Citadel is individually designable and saved as its own ship design. When building, upgrading or downgrading a Deep Space Citadel, you’ll be prompted to select the design the DSC should become.

The Art of the Deep Space Citadel

Hi! I'm Lloyd and I'm a concept artist on Biogenesis. I'm here to give you a look at how I designed the look of the deep space citadel and how the art team brought it to life.

I was very excited to tackle this station. After working on bioships for a while, it was refreshing to have a chance to get back into some hard-surface design. I began by discussing with the team what we wanted the station to feel like, and what it should represent to our players. I came away with a simple mission - make Helm’s Deep in space. Here are my first sketches of the station. You can see I'm focusing a lot on fortress-like structures as well as shield shapes. Both of these are to enforce the idea that this station is a defensive bastion, a place of safety, protection, and strength.

Concept art. Credit: Lloyd Drake-Brockman

Initial sketches of the deep space citadel. Artist: Lloyd Drake-Brockman


We decided to go with something like option B. This design became more refined as I worked on it, and as it was fleshed out into a three-stage structure. Here you can see an early look at the 3D blockout for the concept art.

Early 3D Concept. Credit: Lloyd Drake-Brockman

Early stages of the 3D concept. Artist: Lloyd Drake-Brockman

Here, I had the idea to bring the shield motif back in the later stages, surrounding the station with shield-like arms that start as round shields in stage 2, but expand to be tower shields in stage 3.

With the design locked in, I polished up the details into the final concept sheets. These sheets inform the rest of the art team how to make the asset. Our philosophy is that a concept should solve as many problems as possible, instead of leaving them for the 3D, texturing, and animation stages.

Stage 1 final concept. Credit: Lloyd Drake-Brockman

Stage 1 final concept art. Artist: Lloyd Drake-Brockman
Stage 2 final concept. Credit: Lloyd Drake-Brockman

Stage 2 final concept art. Artist: Lloyd Drake-Brockman

Stage 3 final concept. Credit: Lloyd Drake-Brockman

Stage 3 final concept art. Artist: Lloyd Drake-Brockman

Turrets final concept. Credit: Lloyd Drake-Brockman

Turrets final concept art. Artist: Lloyd Drake-Brockman

You can also see the added details of the internal gravity torus, which would allow inhabitants to live comfortably even with a failure of artificial gravity systems, a massive reactor for power, and complex shielding systems. All of this is added to paint the picture of a steadfast, independent station, able to withstand punishing sieges.

With the concepts done, the task moves on to the 3D team who model and texture the station.

WIP model. Credit: Emma Quer

Work in progress on the 3D model of the Deep Space Citadel. Artist: Emma Quer

The last stage of the DSC is animation. Some of the parts of the station were designed to move, and it's always so exciting for me to see an asset come to life in the game.


Animated DSC Stage 1. Credit: Mia Svensson
Animated DSC Stage 2. Credit: Mia Svensson
Animated DSC Stage 3. Credit: Mia Svensson

Animation of the Deep Space Citadel Artist: Mia Svensson


That's it! That's how we brought the Deep Space Citadel to life for Biogenesis. Personally I thought this was one of the most fun assets to work on, and I hope you enjoy what we’ve made. We really poured our hearts into it!


New Origin: STARLIT CITADEL

Some empires are born into prosperity. Others arise under siege.

CGInglis here, reporting from far beyond the walls to bring you a closer look at the Starlit Citadel Origin, our latest offering for those who prefer their games with a little bit of defiance and a whole lot of fortification!

How many secrets are in this image?

Nothing says 'welcome to the neighborhood' like a massive orbital fortress.

Long before their species turned its eyes to the stars, a mysterious wormhole lingered on the edge of their home system. From its depths came wave upon wave of aggressors in biological ships. Entire cities were flattened before the invaders were defeated. Then they returned. Again, and again.

Faced with extinction, these beleaguered people placed their hope in the Deep Space Citadel, a towering bulwark bristling with defensive armaments, constructed not at the heart of their system, but precisely where the invaders emerge.

Please do not resist, you are being defended

Hi there! I’ll be your turret-encrusted server today. May I recommend the Mass Driver, served with a large side of Point-Defense Flak?

Empires with this Origin begin the game with a fully operational Stage I Deep Space Citadel positioned at the breach. Their homeworld also features a unique building, the Citadel Uplink, which coordinates the empire’s defensive efforts.

This Building supports a rare specialist role, the Skywatchers. Linked to the Citadel through advanced communication arrays and strategic uplinks, the Skywatchers provide a potent array of bonuses: increased planetary stability, bonus naval capacity across the empire, and spawning additional defense armies. Perhaps most significantly, their efforts amplify the effectiveness of all Deep Space Citadels, starbases, and defensive stations within the system.

Skywatcher-1 to DSC Uplink, do you copy?

All-seeing, ever-watchful, mildly overworked.
Your homeworld, though (probably) rich in history, bears the scars of conflict. Marring the surface are the blasted remains of the last wave of invading bioships:

DO NOT EAT

“And I thought they smelled bad on the outside!”
This Origin also introduces a unique dynamic for multiplayer campaigns. If several players choose to be a Starlit Citadel empire, each will begin with their own perilous portal and their own Deep Space Citadel. As the campaign unfolds, these enigmatic wormholes are revealed to be more than isolated anomalies. Like spokes on a terrible wheel, they all lead to a single, central hub:

Wormholes, they're perfectly safe!

Who are these guys, and why are they so deeply unchill?

The Starlit Citadel Origin invites players not only to withstand these threats, but also to uncover their source. Whichever empire reaches the hub system first will face the full force of the invaders. If you prevail, you’ll have the chance to fortify this keystone system and reshape the balance of power.

Choose this origin if you enjoy a playstyle centered on defense, a narrative-driven mystery, and just a hint of betrayal among friends!

Next Week

Next week @PDS_Iggy will be introducing us to the Fallen Hive Mind Empire, the Fallen Hive Mind Empire, the Fallen Hive Mind Empire, and the Wilderness origin.
 
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Well yes and no, you can spread damage across ships when a doomstack rolls in — but stations really can’t. They’re capped, limited, and stuck with hard platform limits per system. It’s always a numbers game, and stations will never outnumber fleets. So you either dump time and resources into fortifying one system just to slow a doomstack, or you build your own. And sure, once you're deep into soft cap and your economy’s stretched, maybe you start throwing alloys into citadels — but by then, you probably don’t need them. - Oh well, you could just make stations hilariously OP and create the precedent that fleet power numbers aren’t a real metric anymore. But where’s the fun in that?

That’s the problem. If orbital rings or stations were actually viable, we wouldn’t even be having this conversation. This Deep Space Citadel feature is just another patch on top of a broken foundation — a way to see if defenses can feel meaningful, without addressing the core issue: the game is built around doomstacks. The mechanics that make it shallow — uncapped fleets, simplified combat, brute-force meta — those are untouched. And yet we’re capping the few things that might actually diversify play. It's not that depth isn’t possible — it’s that this isn’t the way to get there.
Idk, even with just 30 platforms per citadel, which is a relatively low amount, you would have a total of 120 defense platforms

All shooting at least 2 torpedoes each at any fleet jumping into the system, that's gonna hurt your artillery fleets pretty badly

And that's not even maximum numbers, you can breach 50 capacity on a starbase, I assume citadels will be similarly silly, so you may be looking at like 200 defense platforms, which a bunch of fancy auras

That's a lot of cheap firepower, on top of the fleets your target has

You may be able to outclass the citadels eventually, but you will never be able to outclass the citadels reinforcing your victim's fleets

With the citadels and the starbase you can also stack a whole bunch of silly auras, so that anything that attacks gets lower stats and anything that defends gets higher stats
 
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Bad choice of words on my part. I meant a system where fleet presence is measured/supported per system. I don’t know what the game designers wanted to come up with — I’d guess a hard cap (lol). If it were me, I’d just have a soft cap that, if overstepped, ramps up costs and decreases effectiveness.
I think we're on the same page we're just quibbling over per ship vs per fleet and per system vs per combat.

Basically a doomstack isn't a doomstack unless it's in combat. Out of combat it's just a bunch of ships that happen to be near each other. Effectiveness only matters in combat so there's no point in applying it out of combat, and costs out of combat lead to weird incentives like microing all your fleets one system apart to converge on the actual combat or swearing because two fleets crossed paths on different missions and dinged your treasury just by passing by each other.

So I'd be looking for out of combat:
Jam as many ships as you like wherever you like. Density doesn't change anything. Maybe have a note giving out if it's a silly amount that could cause problems if a fight broke out.

But when combat starts:
-> perform some kind of number of ships in combat (or in system) check
--> oh that's like twice the "correct" amount, I'm gonna multiply your in-combat logistics spends by a chunk lol.
--> and I'm gonna give the other guy some bonuses.
--> and a bunch of your excess ships don't get a bunch of bonuses* they're normally entitled to.

It sounds like some form of the first one is coming in, the second one is kinda already there but could be beefed up a bit, and we'd both like the last one (*except penalties feel worse than losing expected bonuses even if the result is identical)
 
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Part of me is unimpressed by this. From the artwork I expected it to be like the Maginot worlds from the gigastructures mod. I expected it to be a massive complex the size of an entire planet. I think time will tell whether or not this will be as useful as I think it will be. It honestly depends on how many defensive platforms you can build on it. If it's anything like a fully upgraded and fully defended citadel in the late game, it could potentially be enough to take on a 25x crisis.

Nevertheless, I'm excited to finally be able to properly defend the L-cluster.
 
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I'm old enough to remember when this was how defense platforms worked in general.
One-fourth score and four years ago, the developers brought forth on this market a new game, conceived in sci-fi, and dedicated to the proposition that ...?
 
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I've scanned through the entire thread and couldn't find anything about it, so I think this hasn't been brought up yet:

With yet another megastructure in the game, I suggest you have another look at the megastructure construction UI and consider overhauling it.

With all the once-off megastructures, several habitat buildings, orbital rings, ringworlds and now DSCs, the UI is getting really cluttered.

In pretty much every game I have to think about whether or not I've already built this or that unique megastructure because they keep appearing in the build list even if I can't build them anymore, or if they're just greyed out because I selected the wrong celestial body. Like, does the mega shipyard go around a star and the strategy center around a planet or vice versa? Or did I just forget about the sentey array at the edge of the system and that's why I can't build anything else?

Adding an option to remove all megastructures for which one has reached the build limit already would already clean up the UI a lot, but maybe it makes sense to build two separate UIs, one for megastructures which can only be built once (together with a few quality of life features to identify them on the galaxy map at a glance or search for possible sites for new constructions), and one for structures which can be built multiple times.
 
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