Hi there , Can we prevent the spawn of mobs under an Y coord (here 45) on my map (10k blocks/10k blocks) ? Prevent the spawn in underground for resume. I use World Edit and World Guard here. 1) What can I do : - Define an extreme point to 10k blocks from the center of my map, define pos1 with World Edit, then define pos2 to 10k blocks from the center of my map in the other side. - //expand 1 45 up for select 45 blocks under my feets. - /region define zone1 myname - /region flag town mob-spawning deny And no spawn in this big zone. No lag ? 2) But there is easier ? I don't know, a command on World Guard to select the map totality (almost infinite so) and say "no spawn under Y=45" ? Thanks for your help.