Hopefully this goes here. So there was some discussion in the crimes against minecraft thread about automating emerald production in a way that does not result in mass villager deaths. After a couple of days of mucking about here is what I call the villager par-boiler. It relies on 6 mods (7 if you want to nit pick): ComputerCraft, Thaumic Tinkerer, Blood Magic, Thermal Expansion, Buildcraft, and Tinkers Construct. In essence we are using Blood magic's ritual of regeneration to heal villagers who have been partially melted by Tinkers' smeltery, producing emerald. The ritual is insufficient to keep the villagers alive in the smelter full time so we mush lift them out every so often by using the Corporeal Attractor from Thaumic Tinkerer set in repel mode. The liquified emerald is extracted by a method best described in this video by @XMrPotatoX . I used a Computer from computercraft as a timer since the healing time is longer than the extraction time. The computer is one block below the attractor so that there is no possibility of the redstone signal interfering with the ritual. I have an override switch on the block for experimentation and because I am terrible with computercraft. The gate acts to reset the system so that the liquid emerald is always on the bottom of the smeltery and can be pumped out by the fliuduct on the left The timer code is my first time working with computercraft and can undoubtedly be improved Code: while true do rs.setOutput("left",true) os.sleep(40) rs.setOutput("left",false) os.sleep(12) end The second sleep time could potentially be changed a little, it currently leaves the villagers with around 9-10 life (some discrepancies in timing occurred when I added the auto extraction with fluiducts) na, just some oddities while testing, those times should be cutting things fairly close. The glass can be any block you want and you can bring it all the way down to the smeltery if you want it fully enclosed. The walls prevent the attractor from pushing the villagers out of the smeltery and the rood prevents fatal fall damage(the villagers bob around if you don't have one and accumulate fall damage which becomes fatal). Other things to par-boil: Iron golems- infinite iron Horses- glue (thanks XMrPotatoX) Also of note: Baby villagers are not affected by the attractor and thus will die in the smeltery. Consider building this in away from villages if you wish to prevent the possibility of villagers breeding. Update: According to @Quesenek geostrata regen potion crystals (or whatever they are called) work on villagers simplifying this build to the basic auto-smeltery + regen crystal. Presumably the crystals work on other meltable NPCs although this remains untested for now.