[UPDATE] Cyber satyr

-added gibbed death States
-now  able to melee attack(you still don't want get closer anyway)
-some fix for C4 6 D4 6 frame(A6 B6 have small update) 
-added gldef

Nice update! I have only two suggestions, can you add GibHealth -50 or something like that? Otherwise you'll almost never see the Xdeath, this monster has too much health for getting gibbed with normal Doom weapons.
And the other suggestion is instead of looping the Missile state, go back the See state after each shot, and give him the MISSILEMORE and MISSILEEVENMORE flags. This will make him a bit more unpredictable and more mobile, and he'll always use the claw at melee range. Right now he's more like a turret, and if you get in melee range while he's shooting at you, he won't stop shooting. But if that's intended, maybe let him alternate between claw and shotgun? That would make him really dangerous in close range combat 
 

Updated . Gave it a GibHealth of -35, and a check during its firing animation. If its target gets too close while shooting, it will try to melee you instead.