To beat the Sea Spider boss in Armored Core 6, follow these key strategies and build recommendations:

Best Strategy to Beat Sea Spider

• Stay Airborne: Use quad or lightweight reverse joint legs to stay mostly in the air, especially in phase 2 when the Sea Spider hovers. This avoids many of its ground attacks and lets you attack from above

• Exploit ACS Strain: The Sea Spider is vulnerable to ACS strain. Equip explosive weapons like Songbirds grenade launchers or a 10-cell missile launcher on your AC's shoulders to stagger it frequently. Once staggered, switch to melee attacks such as Laser Blades or Pile Bunkers to deal heavy damage

• Dodge Melee Attacks: The Sea Spider has a powerful melee lunge with laser blades. Avoid it by quick boosting diagonally forward or backward to slip under or away from the attack. Also, boost away when it hovers to avoid its ground slam

• Match Altitude in Phase 2: When the Sea Spider takes to the air, use quad legs to match its altitude. This helps dodge its laser waves and other aerial attacks while allowing you to maintain pressure

• Keep Moving: Constant movement and strafing are essential to avoid its laser barrages, missile salvos, and sweeping laser beams. Strafing side to side and quick boosting at the right moments will help you avoid damage

Recommended AC Build

Part| Recommendation
---|---
Right Arm| Gatling gun or VVC 760pr
Left Arm| Pile bunker or High 32BU-T Slash Air
Back Weapons| Songbirds grenade launchers and 10-cell missile launcher
Legs| Quad legs (e.g., VP-424) or lightweight reverse joint legs
Booster| BST-G1/P10 or Alula 21E
Head| DF-HD-08 Tian-Qiang or HD012 Malanda C3
Core| CC-3000 Wrecker or BD-011 Malanda
Arms| Nachtreiher/46E or Elta 10 Mazer
FCS| FCS-G2/P05 or FC-006 Abbott
Generator| VP-20C or VP-20S

This build focuses on high mobility and explosive firepower to keep the Sea Spider staggered and control the fight from the air

Summary

• Use explosive shoulder weapons to keep the Sea Spider staggered.
• Stay airborne with quad legs to avoid attacks and maintain pressure.
• Dodge its melee lunges by quick boosting diagonally.
• Use melee weapons like Laser Blades or Pile Bunkers when the boss is staggered.
• Keep moving constantly to avoid laser barrages and missile attacks.

Following these tactics and using a high-mobility, explosive-heavy AC build will make the Sea Spider fight manageable and allow you to defeat this challenging boss effectively