Was pillaring in both the nether and in the overworld and I found the affects are the same , if I build a pillar I will take damage as though the blocks are not even there for example, if I were to pillar an 8 block tower I would take 8 blocks worth of damage and if I built a 20 block high tower I'd take 20 blocks worth of fall damage even if I didn't even move off of the pillar I also found that if the pillar is above lava you'll also get set on fire (this cost me a whole set of diamond tools and a stack of iron by the way has happened to me four times in four different worlds kinda upset about it) could also be reacted to certain stuttering in my game not like a bad disk stutter just everything freezing and the audio bugging out for like 3 seconds