http://imgur.com/a/2zNJ3#Ok5zJw7
Trying to figure out how i screwed up this cursed earth spawner. There isn't really any way to save it at this point, but im trying to figure out what went wrong. I made sure there were no lights anywhere near it. used slabs in the rooms on the ends in case i had to get to the pipes or whatever to keep mobs from spawning. two sets of drawbridges to cover it after doing the ritual and shut it off if i wanted.
Apparently the mob essence creates some light when it goes through the liquiducts. :/ But i checked the spawner and it ran for a couple real world days fine, now suddenly most of it is gone.
And the one screenshot shows the grass is lit up somehow... but there is nothing that creates light. The area in the middle underground is also lit up... no mob essence in the liquiducts when i took the screenshot... I cannot figure out where the hell the light is coming from.