The Hydra is the dragon-like boss of Salamander 2's stage 2. It is notable for being one of the few mechanical bosses in the Gradius series that does not have a core of any kind. It has seven heads.
The Hydra will simply float at the top of the screen, firing flames randomly from each of it's heads. It will swere around over you occasionally, which can be strangely hypnotizing. It will rarely switch its attack pattern, where it will recoil all of its head and launch a HUGE blast of fire forward. This fire moves slowly, so the best way to fight the battle is to leave your options in front of the heads, as they cannot fire in any direction other than straight down.
|Ships||Vic Viper • Lord British • Sabel Tiger (Iggy Rock) • Thrasher (Zowie Scott) • Super Cobra • Galaxy • Purple Emperor • Red Devil|
|Salamander stages||Bionic Germ • Meteorite Space • Burning Chaos • Volcano Area • Salamander Planetoid|
|Salamander (MSX) stages||Top Flight Speed to Latis • Conduct to Space Station Zot • Set the Crush Blow System - Planet Eioneus • Set the Crush Blow System - Planet Lavinia • Set the Crush Blow System - Planet Kierke • Wrath of Venom • Crush Salamander|
|Life Force-only stages||Organic Speed Zone • Temple Zone|
|Salamander 2 stages||Sub-life Space • Prominence Fortress • Bio Hazard • Huge Battleship • Asteroid • Doom Fortress|
|Salamander bosses||Brain Golem • Tetran • Intruder • Fortress Valis • Death • Big Core X3 • Jumping Moai • Zelos Force|
|Port exclusive bosses||Zylom • Gaw • Giga • Tutankhamon • Dead End • Enigma • True Venom • Metal Slave • Zelos Barrier|
|Salamander 2 bosses||Biter • Hydra • Abadon • Tenny Rop • Plate Core • Cerberus • Doom|
|Other||Reckless • Striker • Heavy Ducker • Hydra • Ground Spider • Cerberus|