spark plug issue/difficult

[hidden1]

I have a Dakota 6 cylinder and am having a horrible time getting the last plug out to change it.Its closest to back of motor on drivers side.
The top has broke off down flat to the point where the ceramic is at hex an metal still showing .This is horribly rusted an I've use PBblaster on it for days .All it's doing is turning tightly an nothing goes in or out..the hex was stripped too so I got a socket made for rounded off bolts .

W hat can i try with a easy out or any other techniques or tools?..the center has metal rod still so the easy out can't bite anything . Engine was cold entire time .
I do have a compressor also.
Any info is appreciated

[1998_CHEVY_4x4]

youtube has just about every video on how to fix stuff.

remove plug