U can use devastator when u are in critical m*** or in adrenaline surge.

use my trainer i uploaded

There are 3 different Devastator attacks i think and all of them have an "In Air" version.
The First one is the "Tendril Barrage" wich shoots alot of tendrils from Alex's Body
Eleminating Hundreds of enemies on screen.

You use it by holding down "E" and "Right Click"

The next one is the "Critical Pain" devestator attack, this is the most powerful
devestator move, Alex shoots out a something like a consentrated beam of mass from his
palms. However you can only hit the enemies directly in front of you.

you use it by holding down "E" and "Left Click"

The Next and Last Devastator move is the "Graveyard Groundspike" Alex slams his fist in
the ground and alot of spike's shoots up from the ground, its very effective against Tanks
or rather "Armor" Generally. It also deals alot of damage to buildings if you stand on top
of them.

you use this by holding down both "Left click" and "Right Click" at the same time.

"In Air" Devastator moves: its pretty easy actually you just use the devastator moves
while your in the air.

I tell u about 3 devastators (not counting it's air version)... Tendril Barrage
Devastator

The Tendril Barrage causes spikes made of hard, fibrous tissue to erupt from Alex's body
in every direction, impaling everything around him for a fair distance. It will wipe out
entire crowds of humans and cause extreme damage to Hunters. Even the larger Leader
Hunters will take a fair amount of damage. Armor is virtually immune. The Supreme
hunter/hybrid can do this, too.
Groundspike Graveyard Devastator

The Groundspike Graveyard is similar to the Groundspike power granted by the Claws. When
used, it causes massive spikes of biomass to erupt from the ground, creating a deadly
circle of spikes in close proximity to Alex. It is highly effective against hardened
targets like Armor and buildings, but less effective than the Tendril Barrage against
living enemies due to its shorter range and smaller amount of spikes. This Devastator can
usually destroy a military base or Hive in two hits, three in later stages of the game.
Critical Pain Devastator

Critical Pain fires a hard mass of tissue from Alex's hands to crush a single target. It
is the single most damaging move in the game, but can only be used to hit a specific
target. Anything that happens to be between Alex and the target will also be affected. Its
power is such that, short of bosses and buildings, there is nothing (Except the Supreme
Hunter) that will survive more than two hits.

this is the first time i play prototype and i play just in about 3 hour and then i am
fighting supreme hunter.... :D

It me the First time play.... iam not using cheat i complete all mission