There’s 5 hints at all.
First - main area is system of tight bridges and acid below[1]- swimming is prohibited.
Secondary, in depot, under elevator you’ll rearm with Rocket Launcher[2].
Thirdly, catch health and ammo under balcony[3].
Four - at left side of elevator grab the Armor[4].
Five, go to highest floor and then on left side you’ll see bonus.
We have only few Manta’s and Scorpions.
Nevertheless, you are still able to build nodes, right?
Go to Manta and drive it to the nearest node.
It will allow you to attack central spawn and next one.
2 nodes will left so attack them[1].
How to destroy the core?
Use Manta[2]!
Battle 31
Map: Onyxcoast
Description: Using Leviathan is essential.
Drive it from base and halt near the bridge[1].
Keep on track your first node and left side of the map (node will activate bridge).
Drive Leviathan through the passage and eliminate every Darkwalker and Viper tramping near enemy base.
Secure next node and start gun firing main core[2].
Battle 32
Map: Avalanche
Description: Unlikely circumstance.
Enemy secured both tactical nodes.
Destroying and building new one is difficult, because they’re surrounded by special force field.
You’ll be able to hijack car or tank, so do it[2].
Enemy has Nemesis and Darwalker!
Capturing caves is nice opportunity to lock opponents in next spawns.
Damage Amplifier on metal ring will affect on your confidence[2].
Lower gravity will affect on longer jump, so use it to jump from floor to floor.
In hallway there’s an Armor[4].
It’s the last battle in chapter IV.
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