When initially constructed, the Inferno Tower consists of a tall, narrow tower of rocks straddling a glowing pool of lava. At the top of the Inferno Tower is a circular focusing lens, and a rectangular-shaped Dark Elixir reservoir is mounted on one side. A pool of lava flows at the bottom.
At level 2, huge red flames are emitted from the focusing lens on the top of the tower, and the prominent sections of rock from the first level become gilded with a red overlay. The rock holding the lens becomes gold and the lens themselves become red and the fire overwhelms the ring.
At level 3, its structural supports become thicker and gain gold-colored spikes, as well as the part below the focusing lens. Also, the structure that contains the fire becomes a hollow faceted frame.
Along with X-Bows and Skeleton Traps, Inferno Towers are the only defensive structures with multiple modes.
Although the Inferno Tower is reloaded with Dark Elixir, it fires a continuous stream of fire. This is unlike the X-Bow, which fires bolts made of Elixir.
There is an achievement for destroying a certain amount of Inferno Towers called Firefighter.