Blade Trap
Blade Trap is an inanimate enemy first introduced in The Legend of Zelda.
The Legend of Zelda
These traps were held in the corner of some rooms in dungeons. If Link were to get in the path of them, they'd fly towards him until they hit each other, then retracted. They cannot be defeated because they're essentially an obstacle.
A Link to the Past
Link's Awakening
Ocarina of Time
These spiked obstacles are invulnerable and come in two varieties: ones that move in a set path and ones that ambush you if you get close. Either way, they cannot be defeated, so just wait for them to get on the far side of you and sneak past. In some puzzles, you can use blocks or statues to put in their path so they don't have much wiggle room. They appear in Dodongo's Cavern, the Ice Cavern, the Water Temple, the Shadow Temple, the Spirit Temple, and Ganon's Castle.
Oracle of Seasons
Oracle of Ages
The Wind Waker
Blade Traps appear in the last room of the Wind Temple. They are invulnerable and move back and forth. In order to make it past the room to get to the boss door with Makar, blocks must be placed strategically so that they block the Blade Traps so that they don't get in your way.
Four Swords
Four Swords Adventures
The Minish Cap
Twilight Princess
Blade Traps appear in the Temple of Time. They are very similar to their other appearances because they are basically a moving obstacle. However, this is the first and only time that they are destructible. By taking control of the huge statue and its hammer, one swing obliterates a Blade Trap.
Phantom Hourglass
Spirit Tracks
Skyward Sword
Gallery
Blade Trap Artwork from The Legend of Zelda
Blade Trap Sprite from The Legend of Zelda
Blade Trap Sprite from Link's Awakening
Blade Trap Model from Ocarina of Time
Blue Blade Trap Sprite from Oracle of Seasons and Oracle of Ages
Green Blade Trap Sprite from Oracle of Seasons and Oracle of Ages
Orange Blade Trap Sprite from Oracle of Seasons
Giant Blade Trap Sprite from Oracle of Seasons and Oracle of Ages
Red Giant Blade Trap Sprite from Oracle of Seasons