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These are the skulls that exist in Keros Chronicles. You will be able to activate the others from 1-8 but these are the skulls for this game.

Note: If you activate the skull your achievements will be disabled. Although you can enable your achievements if you disable the skull. In other words, your achievements aren't permanently disabled.

Keros Chronicles Skulls
Mission Skull Requirement Location Effect
Birth of a new Russian Empire Scarab Death Skull Play the mission on Legendary Located at the Kremlin Wall Necropolis, found in the front of the Kremlin wall, stuffed in the trees. Makes game 2X harder
Birth of a new Russian Empire Invulnerability Skull Play the mission on Legendary Located in the Spasskaya Tower, in a secret room, guarded by Dark Juggernauts. Makes player Invulnerable to enemy fire and destruction
This is not the Umbrella Corp Blind Skull None Found on secret room on the 5th floor Disables HUD
The Package Inferno Skull Play the mission on Legendary Found in Board of Directors office

Equips player with Fire weapons:


Flamethrower, flaming granades, incedaries, ect.

Search and Rescue Trapped Skull Kill 10 enemies Found in a hole behind the demolished building Brings more enemies into the level
Iraqi War War Skull Kill 100 enemies Found on the sand dumes Disables shields
Outbrake Disease Skull Play the mission on Hard or higher difficulty Found in the diner underneath the table Lowers shields to half life
Infection Quarantine Skull Play the mission on Normal Difficulty or higher Enemy kills an ally, skull is automatically activated Players weapons are disabled
A Dark Legecy Dark Skull None Found in a blue bus 7th seat Advanced Darkness on the HUD
Operation Iraqi Freedom Freedom Skull

Play the mission on Normal Difficulty or higher


Kill 50 enemies

Found in iraqi palace, in main office Enemies appear with no weapons or grenades
Death to the Al-Kadhum War to end all Wars Skull

Play the mission on Legendary Difficulty

Kill 50 enemies

Snipe 7 enemies in a row

Found in secret area, outside of the quad. Player has the options to skip a level.
All-In Nightmare Skull Play the mission on Legendary Difficulty Found in board of directors office. Parasites are harder to kill
OPEC Enrichment Skull Play mission on legendary and try to find the skull Found if you go around your oil rig 3 times and it appears in the front entrence Allows players on multiplayer to have infinite ammo for their flamethrower attachment
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