If you’ve ever spent 20 hours building a sprawling Endless Space 2 empire only to get crushed by a rival that unlocked overpowered bonuses halfway through the game, you’ve probably wondered what you’re missing. The answer almost always ties back to underusing one of the game’s most powerful, often overlooked mechanics: ARKs. Learning how to use ARKs in Endless Space 2 isn’t just a nice-to-have skill—it’s the difference between scraping by on normal difficulty and dominating galaxy maps on Endless mode without breaking a sweat. I’ve put over 300 hours into the game across multiple factions, and I’ve made every mistake possible with ARKs early on, from wasting them on trivial bonuses to forgetting to deploy them entirely before a war breaks out. This guide breaks down exactly what you need to know to use them effectively, no matter what faction or playstyle you prefer.
How to Use ARKs in Endless Space 2 for Early-Game Snowballing
First, let’s clear up a common misconception: you don’t have to wait until mid-game to start using ARKs. Most new players hold off on claiming them because they think they require too much research or fleet power to secure, but that’s rarely the case for low-tier ARKs in your starting star cluster. Your first priority in every run should be scouting adjacent systems for ARKs within the first 20 turns. You don’t need a full combat fleet to claim most early ARKs—just a single scout ship with a small escort of 2-3 corvettes will fend off the basic guardian units most low-tier ARKs have.
Once you claim an ARK, don’t just activate the first bonus you see. For early game, always pick bonuses that impact your economy first: +10% food output for all your planets, reduced research cost for colonization tech, or extra influence per turn are all far better than combat bonuses when you’re still expanding your empire. If you find an ARK that gives +1 to population growth on all temperate planets, for example, and half your starting systems have temperate planets, that’s a no-brainer pick that will pay for itself within 10 turns. You can also use early ARK bonuses to fix faction weaknesses: if you’re playing as the Unfallen, who expand very slowly, pick an ARK bonus that reduces colonization time to speed up your early expansion dramatically. I once made the mistake of picking a +15% damage to battleship bonus on turn 15, and I didn’t even build a battleship for another 60 turns—total waste of a perfectly good ARK bonus.
Aligning ARK Bonuses With Your Faction’s Unique Strengths
One of the biggest mistakes players make with ARKs is using the same bonus loadout for every faction. What works for the United Empire (which focuses on production and warfare) won’t work for the Lumeris, who make all their money off trade and population manipulation. Always match your ARK bonuses to your faction’s core identity to get 2x more value out of every activation. For example, if you’re playing as the Vodyani, who rely entirely on leeching resources from other systems, pick ARK bonuses that boost your leech efficiency or reduce the cost of moving your mobile colony arks between systems. For the Cravers, who need constant war to keep their population happy, ARK bonuses that reduce ship upkeep or increase combat experience for your units are perfect. If you’re playing a peaceful, science-focused faction like the Sophons, skip all combat-related ARK bonuses entirely and double down on research speed and tech unlock reductions.
If you’re playing a custom faction, take 2 minutes before you start your run to note what your core bonuses and weaknesses are, and map out what ARK bonuses you’ll prioritize as you explore. This small pre-run step will save you from making bad impulse decisions when you claim your first ARK. To make it even easier, here’s a quick breakdown of ARK priority bonuses for the most popular base game factions:
- Sophons: Prioritize research speed, anomaly discovery chance, and tech cost reduction bonuses first
- United Empire: Prioritize production boosts, influence gain, and ground combat effectiveness bonuses
- Lumeris: Prioritize trade route income, population growth, and dust generation bonuses
- Cravers: Prioritize ship damage, troop health, and war weariness reduction bonuses
Advanced ARK Deployment Tricks for Mid and Late-Game Wars
Once you hit mid-game and start clashing with rival empires, ARKs stop being just economy boosters and become powerful wartime tools. A lot of players don’t realize you can activate offensive ARK bonuses that apply debuffs to enemy empires, not just buffs to your own. Offensive ARK debuffs can reduce enemy ship damage by up to 20% across their entire empire for 20 turns, which is enough to turn a losing war into a rout. The catch? You have to spend extra dust and influence to activate these debuffs, and they only work if the ARK is within 3 systems of the enemy’s border.
I used this trick last month when I was playing as the Horatio and got attacked by a Craver horde that had twice as many ships as me. I activated an ARK debuff that reduced their troop landing efficiency by 30% right before they invaded my core production planet, and I held off the invasion with only half the defensive troops I thought I needed. Another little-known trick is that you can use ARK defensive bonuses to protect your border systems during wartime. If you activate a +20% shield strength bonus on an ARK near your border, all your ships and defensive platforms in that system and adjacent systems get that bonus, which makes it almost impossible for enemies to break through your lines. You should also keep in mind that you can deactivate and reactivate ARKs to swap bonuses if your priorities shift, but it will cost you a small amount of influence and you’ll have to wait 10 turns before the new bonus kicks in. Don’t swap bonuses unless you’re sure you need to, but don’t be afraid to do it if a sudden war breaks out and you need combat bonuses immediately.
Common ARK Mistakes to Avoid at All Costs
Even if you follow all the tips above, it’s easy to fall into common traps that waste your ARKs’ potential. First, don’t overinvest in ARKs that are on the edge of enemy territory. If you claim an ARK that’s only one system away from a hostile empire, they can capture it in a single surprise attack and take all the bonuses for themselves. Always leave at least a small defensive fleet parked near high-value ARKs, especially if they’re close to rival borders. Even 5 frigates are enough to deter most small raiding parties from stealing your ARK early on.
Second, don’t waste ARK charges on temporary bonuses that only last 5 turns unless you’re in the middle of a critical war or a race to win a diplomatic victory. Permanent bonuses are almost always better than short-term ones, unless the short-term bonus will let you win the game immediately. One mistake I see all the time is new players using their first ARK charge on a cosmetic or trivial bonus like +1 to happiness for a single planet, when they could be using it for a permanent empire-wide bonus that benefits them for the entire run. It’s okay to hold off on activating an ARK for a few turns until you research the bonus you want, instead of picking the first available option just to use it immediately. Third, don’t forget to upgrade your ARKs as you unlock new tech. Most players don’t realize you can research ancient engineering tech to boost the strength of all your ARK bonuses by up to 50% by late game. I’ve had runs where my upgraded ARKs gave me +30% research output across my entire empire, which let me unlock endgame tech 30 turns earlier than my rivals. ARK upgrades are one of the most underrated research paths in the entire game, so don’t skip them.
At the end of the day, ARKs are one of the most flexible, powerful mechanics in Endless Space 2, and learning how to use ARKs in Endless Space 2 will make every run feel smoother and more rewarding, no matter what difficulty you play on. You don’t have to memorize every single ARK bonus to use them well—just stick to matching bonuses to your playstyle, prioritize economy early, and don’t be afraid to use offensive debuffs when war breaks out. I’ve had runs where a single well-timed ARK activation saved my entire empire from collapse, and once you get the hang of using them, you’ll wonder how you ever played the game without leaning into their power. Give these tips a try on your next run, and you’ll be dominating the galaxy before you know it.