The death vocals have always been my problem with Deliverance. It seems like Mike was kind of losing his death voice during that recording - if you listen to the high screams, it is almost like he could not do it. An example I used before...listen to when he says "endless night" or "movement behind" and then listen to the way he says "glass" from April Ethereal or the high scream right before "enough of this, you will leave me now" in The Funeral Portrait.
It confuses me because Mike recorded Resurrection Through Carnage basically at the same time, yet the vocals are so much different (there are not that many effects on his voice for it to change so drastically).
I still love Deliverance, I am certainly not one of those people that think it was a wasted effort, but I wish the death vocals could be rerecorded.
But yeah, Wreath is pretty damn brutal.