Minecraft wiki entry for Obsidian, associated text: Obsidian is useful for building explosion-resistant structures as it has, along with anvils and netherite blocks, a blast resistance of 1,200; the highest of all blocks obtainable in Survival mode (together with crying obsidian and block of netherite). Obsidian also cannot be destroyed by the ender dragon. However, ender dragons can traverse obsidian blocks without destroying them.