Minecraft wiki entry for Defeating_a_woodland_mansion, associated text: Cobblestone and dirt are the go-to expendable block for building a protective cover to heal, towering or bridging your way across. Although dirt is much easier to gather, keep in mind that it’s not as tough and can be destroyed by a creeper explosion. However, if evocation fangs are coming your way, use dirt instead of cobblestone to build a barrier such that you can quickly mine and escape if the fangs pass through.