Hydras are multi-headed dragon-like monsters originating from Greco-Roman Mythology. Described as a many-headed, poison-spewing serpent that could regrow its heads as fast as Hercules hewed them off, it was natural that such an iconic monster would go on to appear in other fantasy games. A related bit is the Orochi of Japanese myth, which was an eight headed and eight tailed serpent. Susano-O killed it by getting it drunk. He then found Kusanagi in the tail.
The hydra has been around in Dungeons & Dragons literally since the beginning, having appeared in the Basic Set in 1977 and then going on to appear in the 1981 and 1983 Expert Sets, the 1991 Rules Cyclopedia, and then every Monster Manual from 1st through to 5th. Whilst various details have changed across the editions, the core has remained; hydras are quadrupedal, wingless dragon-kin who possess multiple heads on long, serpentine necks. They can regenerate, and favor swampy environments.
Traditional variants of the hydra include the flame-spewing Pyrohydra, and the frost-spewing Cryohydra. They also have a nasty habit of punching outside of their CR. Their regeneration is very strong and they make a large number of attacks per round. In 3rd edition especially, their rules were created to allow fighters with Cleave and elemental spellcasters to feel stronger, and characters without those abilities to be a strait disadvantage. Similarly, nearly any template put on them made them even more dangerous. Results could include Zombie, where the hydra's pseudo-pounce and very strange version of regeneration (that's technically not lost like the normal kind) negating the templates main weakness making hydras (especially pyrohydras, who can't have their heads permanently severed as zombies) a favorite of necromancer PCs. The Monster of Legend template can also make them literally unkillable short of a Wish spell.
Hydras have been a mainstay monstrous unit of the Dark Elves of Warhammer Fantasy. They are extremely tough and vicious creatures that can regenerate and spew fire, but also stupid creatures that depend on Druchii beastmasters to keep them under control.
While there weren't any monsters similar to Hydras tamed by the Dark Eldar or any of the Tyranids creature with similar biology, but there were a lot of reference to it for the Imperials or just humans in general using the mythical beast as a name to many thing that can be compare to it, be it vehicle or enemies.
The Alpha Legion used the Hydra as a symbol and references to many thing like their legion symbol, their war cry and their fighting tactics. Each marine in the legion is a soldier capable of many role even being a leader, strike from multiple directions at once, and which could keep going even with the loss of a head. It is unknown if Alpharius (or Omegon) actually encountered a real Hydras before, or at least read about them on some random book written by space traveling Terrans which led to him fascinate with the creatures. Either way, nobody will never knew what the fuck is up with Alpharius and his legion so fuck knows.
Tyranid has a Hive Fleet called "Hydra" living in the Southern part of the galaxy. They are quite small for a hive fleet and their battle tactics revolves around using massive swarms of small tyranid bioforms like Termagants, Hormagaunts and Gargoyles. The bigger synapse creatures (aka Swarm Lord or Hive Tyrant) command these bioform to attack and if the commanding Tyranids died in battle, it will sent some kind of psychic wave across all the small bioforms nearby to attack whoever killed their big dudes (which is like how a hydra lose its head but many take it's place, except the big dudes that died is replaced with a swarm of small Tyranids). This allows them to take down even the big target with just a bunch of small bioforms.
Magic: the Gathering Hydras
Hydras have been in M:tG from the very beginning, with Rock Hydra, a card that was discontinued for being both terrible and needlessly complicated. WotC attempted to replace it with Balduvian Hydra, which epically failed because the new card was just as complicated and very slightly more terrible (due to being vulnerable to toughness-reducing effects). Hydras made several more appearances throughout Magic's history, usually favoring Green over Red. While a lot of them aren't used competitively, there are plenty of notable Hydra cards, especially in recent years such as Hydroid Krasis, which gives you a load of card advantage and Progenitus, the ridiculously hard to cast WUBRG Hydra that confuses casuals.
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