I’ve wasted hours trying mods on the wrong Vastaywar.
You have too.
Which Vastaywar Can You Mod?
That question should be simple. It’s not.
Players keep slapping mods onto companions that don’t support them. Then they wonder why nothing changes. Why their damage stays flat.
Why their tank just stands there.
This isn’t about theorycrafting. It’s about knowing right now which ones actually take mods. And which ones never will.
No guessing. No patch notes scavenger hunts. Just a clear list.
You’ll walk away knowing exactly where to spend your time and resources.
And how to stop building weak companions by accident.
This guide fixes that.
What Modding a Vastaywar Actually Does
A Vastaywar is a special companion (think) loyal, trainable, and built for battle. Not every creature in the game qualifies. (You can’t mod your pet squirrel.
Sorry.)
Modding means adding upgrades to boost what it already does. More damage. Better armor.
A new trick that saves your ass mid-fight.
But here’s the catch: only certain Vastaywar have mod slots. Which Vastaywar Can You Mod? That depends on its type.
And whether it was designed with slots from the start.
Some give you +15% crit chance. Others let you heal allies once per fight. None of it matters if your companion isn’t a Vastaywar.
(Yes, that’s the official spelling. Yes, it’s weird.)
You’ll see mod slots appear as small icons next to its stats. No icon? No mods.
Period.
I’ve wasted hours trying to force mods onto non-Vastaywar creatures. Don’t be me.
Want the full list of who can take mods? Check the Vastaywar page. It’s updated every patch.
And yes. It tells you which ones have slots right now.
The Moddable Vastaywar: Kavat and Kubrow
Which Vastaywar Can You Mod? Just two: Kavats and Kubrows.
I mod my Kavat every week. It’s a sleek feline (long) tail, glowing eyes, moves like smoke. They’re not just pets.
They boost key chance. They pick up resources. Some even steal enemy mods mid-fight.
(Yes, really.)
Kubrows are dogs. Solid. Loyal.
A little scruffy. They tank hits, stun groups, and keep me alive with health buffs. One saved my ass in a Grineer ship when I forgot to dodge.
Both come in breeds. Smeeta Kavat drops credits. Adarza Kavat steals enemy abilities.
Not the same. Don’t treat them like they are.
Kubrow breeds matter too. Raksa tears through armor. Vulpine gives you overshield.
You pick one. And commit. Breeding locks in traits early.
No takebacks.
You don’t buy these. You earn them. Kavats need a breeding pair and a lot of patience.
Kubrows start with a quest chain that makes you question your life choices. (It involves a dead scientist and a very angry dog.)
Modding starts the second you get them. Their base stats change per breed. Some take more mods.
Some cap out fast. You’ll learn which by trying. And failing.
They’re not flashy Warframes. They don’t do parkour or shoot lasers. But they stick with you.
They adapt. They die for you. Then you revive them and go again.
That’s the point. They’re yours. Not Warframe’s.
Not Digital Extremes’. Yours.
How Companion Mods Actually Work
Kavats and Kubrows get their own mod slots. Just like your Warframe.
I slot mods into them the same way I slot into my frame. No extra steps. No weird menus.
They take three kinds of mods: stats (health, armor, shields), attack boosts (damage, crit), and precept mods.
Precept mods are special. They trigger on conditions. Like Fetch for Kubrows.
It makes them grab dropped loot. Or Charm for Kavats (they) distract enemies for a few seconds.
Which Vastaywar Can You Mod? That’s not about breeds. It’s about what you do with them.
You want a Kubrow that tanks? Stack health and armor. You want one that shreds?
Add damage and a precept like Maul.
Kavats lean utility. I run Charm + health + armor + a speed mod. Lets them kite and control crowds.
Your playstyle decides the build. Not some forum myth. (Yes, people still argue about this on the What Is Vastaywar Forum.)
Don’t overthink it. Try one setup. Die.
Change it.
Companions aren’t pets. They’re tools. Tune them like weapons.
You’re not building a character. You’re solving a problem.
What’s the problem right now? Enemy density? Loot scatter?
Crowd control?
Pick mods that answer that.
Not every mission needs the same setup.
I swap mine weekly. Sometimes daily.
Non-Moddable Companions Explained
You can’t mod every companion the same way.
Not even close.
Sentinels, MOAs, Predasites, and Vulpaphylas are not Vastaywar.
So they don’t use Vastaywar mods.
Which Vastaywar Can You Mod? Only Kavats and Kubrows. That’s it.
Not others. Not ever.
Sentinels get their own separate mods. Like Sentinel Health or Sentinel Weapon Capacity. They slot into Sentinel-specific slots.
Not Vastaywar slots. (Yes, it’s confusing at first.)
Predasites and Vulpaphylas use Link mods instead. These change how they connect to you (not) how they fight or move. Totally different system.
Totally different UI.
MOAs? They only upgrade via their chassis and systems menu. No modding interface at all.
Just build choices.
Trying to drag a Kavat mod onto a Sentinel does nothing. It won’t equip. It won’t show up.
It just sits there mocking you. (I’ve done it.)
This isn’t a bug. It’s by design. Warframe gives each companion its own rules.
Respect them (or) waste ten minutes wondering why your mod won’t stick.
If you’re stuck, check the mod’s tooltip. It says “Kavat” or “Kubrow” right there. Anything else?
Wrong companion. Move on.
Mod Your Vastaywar Like You Mean It
I mod my Kavat for survivability first. Not flash. Not lore accuracy. Alive.
You want speed? Fine (but) if your Kubrow dies in two hits, what good is that dash?
Some breeds tank better. Some hit harder. Some just exist to distract.
(Which Vastaywar Can You Mod? Start there.)
I skip mods that fight the kit. No point forcing a stealth Kavat into a taunt build.
Rank up your mods. Unranked = wasted inventory space.
Try one change at a time. Then go kill something. See what sticks.
That “perfect” build on Reddit? Probably died twice before lunch.
Your playstyle matters more than any meta guide.
And if your laptop chokes on Vastaywar’s particle effects? Good luck modding anything. Check Which Laptops Can Run Vastaywar first.
Your Companions Are Waiting
You already know the answer to Which Vastaywar Can You Mod. Kavats and Kubrows. That’s it.
No more guessing. No more wasted slots.
I’ve been there. Staring at a mod I couldn’t apply, wondering why my companion felt weak. It wasn’t you.
It was the confusion.
Now you know what works.
You can build something that hits hard, stays alive, and actually helps you win.
So stop reading. Go into the game right now. Grab a Kavat or Kubrow.
Slot your first mod. See what changes.
You wanted clarity. You got it. Now go make it real.