Welcome to Librarium Online!
I am new in tyranid so i dont know is the old one eye good
As said on another topic:
Depends... As far as CC Carnifexes go, OOE is great. It's Regeneration ability makes it rather survivable, and makes for one helluva fire magnet... If Your opponent chooses to shoot at it.
That's because since it's so slow, Your opponent can easily ignore it for the first couple of turns.
And please, name Your topics in a more informative way. If You want to know about the OOE, then name the topic accordingly.
"The meat things seek to destroy ourselves. They hunt us as we hunt them but they are weak and uncertain. The inferior flesh will be entirely destroyed, all biomatter consumed. Ourselves will fight to the last, all weak flesh must be devoured."