Icon of Sin is a titan who wants to destroy Earth.
This boss is big and slow but has a few menacing attacks, e.g.
fist attacks, breathing fire, and powerful ranged attacks.
Shooting at exposed points does nothing - you have to shoot down armor from all body parts first.
You will also have to fight the lesser demons.
The most important thing is to maintain mobility.
The chaingun also works well.
Leave BFG for stronger demons.
Use the Crucible - you will find plenty of charges here.
Once you destroy the 8 armored points on the beast’s body, you will start the second phase.
It looks the same as before, except you have to destroy the boss’s body parts.
Destroy the points on the boss’s body, kill monsters, and be mobile.
double-check you have a large supply of health and armor.
Save the Ballista and the Chaingun for the boss.
Use the BFG and the rest of the weapons to kill the demons.
After a long struggle, the boss will finally die.
You saved Earth from the demon invasion… at least for now.
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