Originally posted by umop-apisdn:

It should be noted that placing a portal "backwards" can put you inside a large boulder, too... and you can see out of it (on any faces that are uncovered on the outside) and shoot through it, too... although apparently unlike mobs, exiting is as simple as walking out of it.

Those big rocks in the plains are more useful than you may have thought.

https://youtu.be/ky9xo_UwQAA?t=426
(The plains boulder how-to starts at ~ 7:06)

Interesting. There could be use be use for these early in the game, but I'm afraid I'm going to fall off the map and die for nothing if I just go try it now.

Originally posted by Ciuy:

i had undead and other fauna spawn from close proximity nests inside the mud piles, like archers. Had to pickaxe it to reach him. Sometimes i get blobs stuck on Top of the mud pile outside or inside the wall, top of the tunnel the pile is blocking; unreachable. Yes it`s a spawning issue. No collision detection, just spawn.

Oh yeah it's so cramped in there no wonder these issues can occur.