Looking for a Shell that can stay aggressive, close gaps quickly, and still take a few hits? Proxima might be exactly what you need. Her Biosampler gives her excellent mobility while also setting up Lightning, Stasis, and powerful follow-up attacks, making her effective against both regular enemies and tougher bosses. In this Mortal Shell 2 Proxima build guide, we'll break down her best skills, weapons, Tarstones, and build setups so you can choose between heavy burst damage and faster, more aggressive combos.

Once you start using Proxima, you'll quickly find that her strength comes from keeping the Biosampler loop going rather than waiting for the perfect moment to use it. If you want to continue exploring, farming materials, or practicing that rotation when you're away from your PC, OSLink lets you play your Mortal Shell 2 PC session from your mobile device, so you can keep working on your Proxima build without being tied to your PC.

How to Unlock Proxima in Mortal Shell 2

You can unlock Proxima very early in the game, shortly after completing the prologue and reaching the Marrowkeep area, making her a great Shell to pick up if you want to try her unique playstyle early on.

1. From Widow Overlook, head north toward the Blackridge Pass Beacon.

2. Face the Beacon and head right into Blackridge Cliffs.

3. Take the upward slope on the left and continue toward the Shattered Beacon.

4. You may encounter an Infested Stalker along the way, but you can ignore it if you want.

5. Enter the Shattered Beacon and interact with the corpse or memory in the central room.

6. Claim Proxima to unlock her as a playable Shell.

Once unlocked, she comes with solid durability and immediate access to her signature Biosampler ability, giving you a good introduction to her aggressive, gap-closing playstyle.

How Does Proxima's Biosampler Work?

Proxima's entire build revolves around Biosampler, an active ability that fires a hook from her left arm and changes how she approaches fights. Against smaller enemies, Biosampler pulls them toward Proxima. Against larger enemies, Proxima pulls herself toward the target before delivering a follow-up strike. This makes it useful for closing gaps, interrupting enemies, applying Lightning, and setting up your next attack.

With the right upgrades, Biosampler can also add more Lightning stacks, Stasis, splash damage, stagger damage, and other effects. This is why reducing its Resolve cost, increasing its damage, and improving its Stasis potential are key priorities in a strong Mortal Shell 2 Proxima build.

Grafted Armor 

Proxima also has Grafted Armor, a passive that gives her a 15% base chance to mitigate melee and ranged damage. When mitigation triggers, the hit deals 50% less damage and does not stagger her.

This makes Proxima more forgiving for newer players, especially when combined with upgrades that create additional mitigation windows and support her aggressive playstyle.

Situational Upgrades

Collector is worth considering when you need more currency. It can generate Extracted Specimens through Biosampler, which you can sell to merchants for Coins.

Reflection is another situational option, especially if you want more protection against projectile-heavy enemies.

Recommended Skill Priority

For most players, use this order:

Attunement → Biohazard → Seizure → Biohunter → Exoshell → Discharge

For an early build with around 13 Shell Points, you can use:

• Biohunter: 3

• Biohazard: 2

• Attunement: 1

• Exoshell: 1

• Seizure: 1

• Discharge: 1

As you gain more points, max out Attunement for cheaper Biosampler use and continue investing in Biohazard, Seizure, and Biohunter.

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Best Mortal Shell 2 Proxima Builds

Proxima has two strong build options in Mortal Shell 2. Both focus on using Biosampler often, but they have different playstyles. The Lightning Burst Build focuses on big damage and Stasis, while the Duality Build focuses on fast attacks and constant pressure.

Best Proxima Build 

The Lightning Burst Build is the best choice if you want high damage against bosses and strong burst attacks. Use Biosampler to close the gap, apply Stasis and Lightning, then follow up with heavy attacks while the enemy is locked down.

Best Weapon for Proxima 

Axatana is one of the best weapons for a Mortal Shell 2 Proxima build if you prefer fast attacks and aggressive combat. Great Martyr's Blade is a good alternative if you want slower attacks with higher damage. For the strongest Stasis setup, use a weapon with Stasis infusion to stack with Biosampler and keep enemies locked down longer.

Best Sidearm for Proxima

The Triarch Repeater is the best sidearm for Proxima for this build. It gives you ranged Break damage and lets you pressure enemies before getting into melee range.

Best Seal for Proxima 

Untarnished Seal is the best overall choice. Its Perfect Guard helps you create openings and build Break.

Other good options include:

• Vatra's Seal – Better for a safer, tankier playstyle.

• Infinite Seal – Good if you are confident with parries.

Best Tarstones for Proxima 

Use Tarstones that improve critical damage, Lightning, and your charged attacks:

• Grudge Stone – Helps set up critical hits.

• Voltaic Crown – Adds Lightning synergy.

• Acolyte's Stone – Improves charged attack damage.

• Rupturing Stone – Improves ranged Break.

• Voltaic Amber – Adds Lightning to your sidearm.

• Auspicious Stone – Improves critical chance.

• Headsman's Stone – Improves critical damage.

• Clerik’s Stone – Great for heavy attacks against Stasis-locked enemies.

Best Items for Proxima 

The key is to keep using the Biosampler instead of saving it. Proxima's entire build revolves around this ability, so using items that keep your Resolve flowing will give you much better damage and control.

Lightning Burst Combat Loop:

1. Use Biosampler to close the gap.

2. Apply Stasis and Lightning.

3. Use the Triarch Repeater if you need Break damage.

4. Use a charged or heavy attack.

5. Keep attacking while the enemy is locked down.

6. Use Common Moonshine when you need Resolve.

7. Use Biosampler again as soon as possible.

Proxima Build Tips

A good Mortal Shell 2 Proxima build focuses on frequent Biosampler use, strong Resolve management, and the combination of Lightning, Stasis, and damage mitigation.

Manage Your Resolve

• Use Biosampler often instead of saving it for emergencies.

• Prioritize Attunement to reduce Biosampler's Resolve cost.

• Use fast weapons to build Resolve more quickly.

• Keep Common Moonshine available for Resolve recovery.

Upgrade Important Tarstones First

• Focus on your core Tarstones instead of spreading upgrade materials too thin.

• Upgrade your strongest damage and Stasis Tarstones for bigger power increases.

Use Your Mitigation Windows

• Use Biosampler, dodges, and aiming windows to take advantage of Exoshell's damage mitigation.

• Stay aggressive during these windows while still watching enemy attacks.

Combine Lightning and Stasis

• Use Stasis to create safe openings for charged attacks and heavy finishers.

• Use Lightning for extra damage while enemies are under control.

• Use Stasis-infused weapons to make this combination even stronger.

Use Collector for Extra Coins

• Take Collector when you need more Coins for upgrades.

• Sell the specimens from Biosampler to merchants for extra currency.

Adjust Your Build for Bosses

• Open with Biosampler when you have a safe opportunity.

• Build Break with your sidearm or Perfect Guards.

• Use Stasis and Lightning to create damage windows.

• Use charged or heavy attacks while the boss is controlled.

• Invest in Biohunter for stronger single-target damage.

• Expect less Stasis effectiveness against bosses with higher Stasis resistance.

Proxima Strengths and Weaknesses

Proxima is a well-rounded Shell with strong damage, mobility, and survivability, but she also has a few weaknesses to consider before choosing her for your Mortal Shell 2 Proxima build.

Strengths 

• Excellent mobility and gap-closing.

• Strong early-game power.

• Beginner-friendly durability.

• Good melee damage.

• Lightning damage and Stasis synergy.

• Strong crowd control with splash and Discharge.

• Flexible enough for burst or fast attack builds.

• Unique currency farming potential through Collector.

• Effective against both regular enemies and bosses.

Weaknesses 

• Heavily dependent on Resolve without proper investment.

• Biosampler is less effective when you cannot manage its resource cost.

• Some bosses resist Stasis more than others.

• Later-game Shells may outperform her defensive stats if you do not optimize her build.

Conclusion

Proxima is a great choice if you enjoy staying aggressive and turning mobility into damage. Keep Biosampler available, manage your Resolve carefully, and combine Lightning and Stasis to create openings for charged and heavy attacks. Whether you prefer the burst-focused setup or the faster Duality playstyle, the right skills, Tarstones, and weapons can make Proxima effective throughout both exploration and boss fights. And when you're away from your PC, OSLink lets you continue accessing your Mortal Shell 2 session from mobile, making it easier to keep progressing and practicing Proxima's fast-paced combat loop wherever you are.