Well about a few months ago i got terraria and it was all updated and stuff. So i had to create a new world. After a while i'm all set to go to the underworld. So i mine a shaft to mine there and encounter a voo doo demon. I of course defeat it but it dropped the guide voo doo doll into the lava. Unfortunetly as i found on this wiki afterwods that how the wall of flesh can be summoned. And of course i couldn't beat it. So i used the magic mirror and escaped. But with a consiquence.. Next time i go to a new biome like the hallow for example i'm looking it up so my base dons't get trashed and my charactor killed.