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how to tell alchemical hydras attacks apart osrs

How to Tell Alchemical Hydra’s Attacks Apart in OSRS

You can tell Alchemical Hydra’s attacks apart by looking at the projectile style , the sound , and the phase colour of the boss. The Hydra alternates between Magic and Ranged for its normal attacks, and each phase also has a unique special attack (acid, lightning, and fire) that you must dodge using movement and pray switches.

Quick difference: Magic vs Ranged normal attacks

  • Magic attack :
    • Looks like a double-blob or two-part projectile coming from above.
* Sounds like a typical magic “whoosh” / projectile slam.
  • Ranged attack :
    • Looks like a single fang/spike or thin projectile, not the double-blob.
* Sounds like a ranged “thwip” or spike hit.

In the first three phases, the Hydra does three of the same attack type , then switches:

  • 3 Magic → 3 Ranged → 3 Magic → 3 Ranged, etc.
  • The first hit of the fight is random, but after that it’s very predictable.

“The magic attack is the one that comes from above and the ranged attack is the one…”

“The alchemical hydra uses both range and magic attacks the magic attack is this double blob looking projectile well the range hit is just a single fang or a spike kind of…”

Phase-by-phase special attacks

Each phase has a unique special attack that happens after:

  • 3 standard attacks, then again after 9 more standard attacks (if the phase lasts long enough).

1. Green phase (poison / acid pools)

  • Boss colour: Green.
  • Special: Acid/poison pools splat on your tile or in a small spread around you.
  • How to tell: Large green blobs/spots appear on the ground where you’re standing or near you.
  • Dodge: Move a couple tiles away before the splat lands.
  • Prep: Bring Antidote++ or similar poison protection.

2. Blue phase (lightning / electricity)

  • Boss colour: Blue.
  • Special: Lightning bolts come down at you.
  • How to tell: Blue lightning arcs and a bright flash around you.
  • Dodge: Move before the lightning hits; you can also use Protect from Magic to reduce damage, but movement is key.
  • Tip: Guides call this the “lightning skip” and show specific tiles to stand on to avoid it cleanly.

3. Red phase (flame walls + fire trails)

  • Boss colour: Red.
  • Special: Flame walls appear, and the Hydra shoots fire behind you as you move.
  • How to tell: Red walls form and fire trails follow your movement path.
  • Dodge: Keep moving smoothly; if a flame trail is on you, turn off run and walk until it burns off.
  • Beta: This is the most punishing special; getting hit can mean 5×5 damage bursts plus the base hit.

4. Black / JAD phase (two-headed phase)

  • Boss: Drops to two heads (black/dark).
  • Normal attacks: Switch every single hit instead of every three.
    • If the last hit in red phase was Ranged → next hit is Magic, then Ranged, etc.
    • If the last hit was Magic → next is Ranged, then Magic, etc..
  • Special: After 3 attacks, it does another acid/pool special like in the green phase, then 9 more attacks, then possibly another acid special.

How to track the rotation in practice

You can use a simple mental counter:

  1. Note the first attack type (magic or ranged) by watching the projectile.
  2. Count: 1–2–3 of that type.
  3. On the 4th hit , switch your prayer:
    • If 3 Magic → switch to Protect from Missiles.
    • If 3 Ranged → switch to Protect from Magic.
  4. Repeat the 3–switch pattern until the phase changes.
  5. In the black/JAD phase , switch every hit instead of every three, based on the last red-phase attack.

Visual summary table

Attack type| Projectile look| Sound cue| When it happens
---|---|---|---
Magic (normal)| Double-blob from above| Magic “whoosh”| 3 in a row, then switches to ranged
Ranged (normal)| Single fang/spike| Ranged “thwip”| 3 in a row, then switches to magic
Green special| Acid/poison pools on ground| Splash/splat| After 3 + again after 9 normal attacks
Blue special| Lightning bolts down on you| Electric crackle| After 3 + again after 9 normal attacks
Red special| Flame walls + fire trails behind you| Fire hiss/roar| After 3 + again after 9 normal attacks
Black/JAD normal| Alternates magic/ranged every hit| Mix of both| Every single hit, not every three
Black/JAD special| Acid/pools again (like green phase)| Splash/splat| After 3 attacks, then possibly again

Practical tips while fighting

  • Pray switch : Always switch protect prayers based on the 3-hit pattern (or 1-hit in JAD).
  • Movement : For specials, move before the projectile lands, not after.
  • Tiles : Use known tile markers (many guides share importable tile sets) to stand on safe spots for lightning and fire skips.
  • Venom/poison : Antidote++ is standard; you can still get poisoned on the green special if you stand in it.
  • Damage reduction : Lure the Hydra onto the correct vent colour for each phase to remove its 75% damage reduction; wrong colour increases damage.

Information gathered from public forums or data available on the internet and portrayed here.