cmd_offsetworld - LiXizhi/ParaCraft GitHub Wiki

command: /offsetworld

quick ref:

/offsetworld offsetY

description:

Offset the entire world vertically to make room for very low or high blocks. 
This is a very time comsuming job and should be used with care. It will search disk for all blocks.
/offsetworld 2    : move all world blocks upwards by 2 blocks.