A tail is used for things like balance or grasping objects. Another use is a weapon, which can vary from flailing, whipping, or crushing. It is only logical then that a combatant would add things to make their tail hit harder like a club. Why just hit when you can also shoot stuff or stab with a stinger on the end, which may or may not be venomous? This trope is about weapons on tails, be they natural or not.
Part of the Anatomy Arsenal.
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Mazinger Z: Several Mechanical Beasts had armed tails. For example, Danchel not only had a massive tail it used to crush things with but it also shot galons of acid.
Tengen Toppa Gurren Lagann has Adiane, who once used her scorpion-like tail to deliver a vicious beating unto Viral. It's unclear whether her stinger contains venom, since she does most of her fighting from within a giant robot.
Cell from Dragon Ball Z, who introduces a horrifying twist. After stabbing someone with his tail, he actually sucks up all of their internal organs through his stinger, while they're still alive.
One of the first villains in the second arc of New Cutey Honey had an acid-spewing tail.
Sasori from Naruto, whose fighting style is to fight from inside a puppet like a suit of armor. The first puppet he is seen in has a sharp tail coated in poison.
While his actual "body" lacks an actual tail, it is also designed to invoke the scorpion imagery - the role of a tail is filled by a long cable wound up inside his stomach and ending with a poisoned spike
In an episode of Sailor Moon Super S, there is a Monster of the Week, Garigari, with a drill on the tip of her tail, as Para Para's trap is dentist-themed. When she tries to drill Sailor Moon and Sailor Mini Moon's teeth with it, they use the Scream Attack which hasn't been seen since the first episode of the first season.
The Scorpion from Spider-Man. Stegron too, who's very ineffective with it.
Manticore from the terrorist-for-hire group the Jihad in Suicide Squad.
In the Godzilla (2014) tie-in comic Godzilla Awakening, in its dragon-like form, Shinomura's tail ends in a sharp, blade-like protrusion.
Succubae tails in The Return have a host of mono-filaments at the end that can be used in battle like a biological chainsaw.
In Aliens, the Alien Queen uses her tail as a weapon while on board the Sulaco. The novelization makes clear that the xenomorphs secrete a paralytic venom from them which they use to pacify host organisms long enough to cocoon them.
Animorphs: Andalites and their super-fast scythe tails.
Piers Anthony's Xanth novel "A Spell For Chameleon". The manticora has the tail of a scorpion (and is featured on the cover◊).
Redwall: Cluny the Scourge has a poisoned blade he attaches to his long tail.
In Spellsinger, the gatekeeper of Polistrindu is an intelligent beaver, whose personal armament includes a spiked metal plate that turns his flat tail into an intimidating weapon.
Naturally becomes a worry in The Magic School Bus book where the teacher shrinks the class and sends them into a beehive.
Chimeras are one of the confirmed magical beasts of the Harry Potter setting. Hagrid's Blast-Ended Skrewts also have stingers among their many unpleasant attributes.
Vornskrs, first appearing in The Thrawn Trilogy, are vaguely wolflike creatures with heavy venom-bearing tails. When the tails are amputated, the creatures become calmer and are easier to domesticate.
Semi-the-fish in Dr Franklins Island is a creature similar to a manta ray, with a tail that can lash and splash about dramatically when she's at the surface of the water. There is a sting in it, she doesn't know if it's lethal. She never gets the chance to find out.
During Dinoverse Bertram is put into the body of an Ankylosaurus, and naturally his clubbed tail comes in handy several times. It's not his only rear-mounted offensive talent, just the one that's actually dangerous.
In Robert R. Mccammon's novel Stinger the alien antagonist and the biomechanical replicants it creates have segmented tails ending in a heavy ball of spikes which are used as brutal weapons(and in the case of the larger replicants, they are also used to demolish buildings and cars like a wrecking ball).
In Miranda Leek's Twisted, Static the living bumper car can sting people with his cable-tail, apparently vis an electrical shock.
The "Tsunami" Dragon Borg in Rifts has a particle-beam cannon for a tail.
Wyverns (again) in one of the previous versions of Warhammer. A wyvern who was slain could make one last Taking You with Me attack with the stinger before it fell.
Likewise, the 4th Edition Carnifex in Warhammer 40,000 has either a scythe or mace tail upgrade option. The difference? The scythe tail has 1-3 (relatively) weak attacks; the mace tail has one strong attack.
Both attacks can only be used if there's enough enemies around, too.
Many Notorious Monster Species in Final Fantasy XI have special attack for players who get hate from behind, such as Behemoth with "Kick Out", Hydra with "Serpentine Tail", and Khimaira with "Plague Swipe". But the absolute kings of this trope are the Wyrms with Spike Flail which is virtually an Instant Death Radius for the Alliance fighting the mob if someone pulled hate from behind, or for anyone who happens to be near by in the case of certain powerful monsters like Nidhogg.
Trypticon in Transformers: War for Cybertron uses his enormous tail for both projectile attacks (two rows of cannons along the underside fire at you when he has it curled up over himself) and physical attacks (slamming his tail down on one side of the stage, you have to get out of the way AND jump to avoid taking damage).
The giant scorpion boss from God of War III can attack with its sting.
Castlevania: Dawn Of Sorrow had two souls you could get that allowed your character to grow a tail. It would strike whenever you attacked for an additional hit.
In The Legend of Spyro, Cynder has a metal blade at the end of her tail that can be used as a weapon in various ways, including imbuing it with her Poison element. Being she's the only Black Dragon shown, it's unknown if this is simply natural or something Malefor had done to her.
Most Wyverns and other types of monsters in Monster Hunter can and will smack you with their tails. The Rathian and Rathalos can even poison you with theirs like the Wyvern of legend. Luckily, you can usually cut the tails of most monsters off, greatly reducing their effectiveness (or range, at the least).
Standout examples include the Duramboros, which uses its tail like a hammer; Nargacuga, which throws long-range spines by flinging his tail around; and Rathian, who can do an aerial back flip to poison you with it.
Bug! had the eponymous character, who defeated his enemies by jumping on them with his stinger tail. There were also literal army ants that fired grenades out of their stingers, as well as scorpions (who rarely used their tail, preferring to attack with their claws instead).
Black Scorpion from City of Heroes has one of these, as his name would imply. His tail is used for firing energy beams, not stinging, though.
Dark Souls has beast-based enemies that use their tails to knock the player off their feet, and deal significant damage if there is a weapon attached to the tail. Said tail can usually be cut off and collected as a rare weapon...
Which makes the optional killing of the cute dragon girl and cutting off her really short tail very cruel and violent.
Ridley of Metroid fame has a vicious serrated tail. Other adherents of this trope in the Metroid series include Kanden, the War Wasps and the Kihunters.
Tail eaters from the Dragon Quest games, as well as mad hornets.
Giant Scorpions wander the Shapeir desert in Quest for Glory II, and are deadly combatants, the second-toughest random monsters you can fight. Their tails are particularly deadly: when it starts to shake, you'd better either run away, prepare to dodge, or prepare to die, as a single strike will kill you no matter how many health points you have left. Poison cure pills can make you temporarily immune to the scorpion's tail strike, but due to the way the game is coded, it will always wear off when the stinger starts to shake, making the pills functionally useless.
Shantae features scorpion people in the desert outside Oasis Town. The female variant just swipes at you when you come close, but the males will jab their stinger through the ground to hit you from farther away.
There are a couple of Dawn of Time strips involving barbed stegosaurus tails.
There's a small group of fans who like Tailmouths, which are literally humanoid people with 'mouths' in their tail, which is according to them Fetish Fuel material (Not always though, sometimes it's just for the sake of coolness). Unfortunately, there aren't that many tropes for them, so you gotta look real hard.
Many prehistoric creatures, perhaps most famously Ankylosaurus and Stegosaurus.
Gyptodonts, giant armadillos with clubs at the end of their tails.
There are small vipers that have similar spiky tails, but they don't use them to attack. It's still the other end of the viper you should beware of; the thagomizer, which resembles a small invertebrate, is used to attract prey towards the viper.
Some bees, wasps, and ants can spray formic acid from the end of their abdomens.
Including one of the most dangerous flying insects in the world, the Asian Giant Hornet.
Stingrays. A peaceful fish, but bothering it is a very bad idea. Depending on the species, may have a spike up to 40 cm long stabbing with force enough to pierce a wooden boat's bottom.
Those pretty blue or yellow tangs seen in saltwater aquariums? They get their name from the "tangs" protruding from the hilt of a dagger, because they have retractable spines on each side of their tails that they use to discourage pursuing predators. As do their cousins, the surgeonfishes.
Porcupines defend themselves by turning their backs on and lashing their spine-filled tails in the predator's face.
Note that this only applies to the Canadian Porcupine native to Canada and the United States. Other species of porcupines either lack long tails (like the African and Asian species), or have a spineless, prehensile tail (South American arboreal porcupines).
Thematically similar are aircraft tail gunners, much more common in WWII bombers but still extant in modern Soviet bombers, to fight off chasing fighters. Descriptions of them often reference them as the "stinger in the tail".