A simple block, use it to build walls to protect buildings and channel attackers into traps or closer to towers. Can be upgraded from Brimstone to Granite to Forged Steel. Effective placement and use of walls with towers is very important in designing yards. Though small, they help protect from attackers for a cheap price. Walls are best used in making monsters walk into Booby Traps or making them walk for longer before reaching another target, though they can also be used for delaying monsters before they destroy your important buildings.
Under Hall Level
A level 3 Inferno block looks like a combination of a Level 4 and a Level 5 block.
A level 1 Inferno block has a red aura under the block.