Reznor

Reznor are fire-breathing Triceratops that made their debut in Super Mario World. According to the game's instruction manual, they were cursed by Bowser. They are mid-bosses that Mario and Luigi fight in fortresses found everywhere on Dinosaur Land. They are now found in the Mushroom Kingdom since their appearance in New Super Mario Bros. 2. Similar to how the Koopalings are named after various musicians, Reznor are named after Trent Reznor of the industrial rock band Nine Inch Nails.

Super Mario World
In Super Mario World, Reznor spit fireballs at the player. Mario must hit their platforms from below or shoot fireballs at them to defeat them. The player has a limited amount of time available to knock off the first Reznor and then jump to one of their platforms as the floor begins breaking away exposing the molten lava below at the start of the battle. If the player does not defeat the rest of the Reznor promptly, they will have to jump onto one of the abandoned platforms and fight from there. It is, however, possible to defeat all four without doing so.

They are the bosses of four fortresses scattered through the areas of Dinosaur Land: the Vanilla Fortress, the Forest Fortress, the Chocolate Fortress, and the Valley Fortress. The four sets of Reznor all behave the same.

New Super Mario Bros. 2
After a 22-year absence, Reznor reappear in the Nintendo 3DS title, New Super Mario Bros. 2. There is a slight change in their behavior and combat style from their debut, and their appearance has changed slightly, with their chins having a lighter tone. This time, the platforms they stand on are Rectangular Coin Blocks, which can be hit to gain three coins. After a short period of time, a Reznor roars, and the bridge Mario is standing on will start to collapse, much like in Super Mario World. The sound effect for a block falling is heard. Unlike in Super Mario World, where four of them always appear on a single wheel, Reznor appear either in groups of two or four, and their wheel setups can also vary. Reznor can be defeated when Mario hits the block underneath them, hits them with six fireballs or one gold fireball, or simply touches them while under the effects of the Invincibility Leaf. If defeated by a gold fireball, they will release thirty coins each. They are the bosses of towers, and the battle theme is a cover of the Super Mario World boss battle theme.

Level Appearances

 * World 1-Tower: Two Reznor on one wheel with four Rectangular Coin Blocks.
 * World 2-Tower: Four Reznor on one wheel with four Rectangular Coin Blocks.
 * World 3-Tower: Same as World 2-Tower.
 * World 4-Tower: Four Reznor on two wheels; two Reznor per wheel, with each wheel having four Rectangular Coin Blocks. One bridge is positioned to the left of one wheel, while another bridge is positioned to the right of the other wheel.
 * World 5-Tower: Four Reznor on two wheels; two Reznor per wheel, with each wheel having four Rectangular Coin Blocks. One bridge is positioned between the two wheels.
 * World 6-Tower: Four Reznor on one giant wheel with eight Rectangular Coin Blocks.

Super Mario Adventures
In Super Mario Adventures, several Reznor are shown to inhabit the basement of the Koopalings' Tower, attacking anyone who is dumped into the basement. These Reznor were apparently destroyed when, after attacking Princess Toadstool, Friendly Floyd, Mario, Luigi, Toad, and Yoshi, the Reznor ignited a bomb held by Princess Toadstool, blowing up the Koopalings' Tower.

Later in Super Mario Adventures, several Reznor, riding their spinning platforms, can be seen at Bowser's wedding to Princess Toadstool.

Super Mario-Kun
Reznor appear in the Super Mario World adaption of the Japanese manga, Super Mario-Kun. They attempt to spin very quickly in order that Mario and his friends cannot hit them, but due to the speed, they fall off their platforms, thus making Mario and his friends win the fight. They reappear in volume 4. Only one, however, is apparently real. During the fight, the Reznor knocks Mario onto a large building that resembles a ! Switch. Inside, there are many Spinies and one P-Switch. Mario uses the P-Switch to score multiple lives, giving him several clones. They then defeat the Reznor.