I invite all mods/admins/... to use a portal to the outer lands. The things you will see there! So in other words it doesn't work at all. It teleports us underground and messes with block textures. I recorded it so I'll try to post a link to the footage here soon.
I was with CommonExplosion in game, and can verify that the portal does not work. I have also tried it in SP, and it works there. The problem is that we are sent to the same area, just a couple of blocks down, in the same dimension, but there are ghost blocks and wrong textures everywhere.
In thaum configs, make sure Code: B:allow_cheat_sheet=false is set to True. In SP, get the cheat sheet, and right click to get the needed research to do this. Locate an eldritch altar Place 4 Eldritch eyes into the bottom part of the middle structure, 1 on each side. Use a fully charged Silverwood wand or better, to rightclick the bottom part. If done successfully, the node in the middle should become more like a black hole. Walk into the hole, and you should be teleported into the Outer Lands.
Uploading videos now. They are not edited because it's just to show you guys what happens. For the research it is /tc research <name> all or /research <name> all. Can't remember which one it was.
sometimes the portal doesn't link to a dungeon, in that case use bound armor with a void sigil in it and an air sigil, make SURE to have lots of LP stored