Guide:Primordial Wyrm strategies

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Primordial Wyrm
Primordial Wyrm.png
Primordial Wyrm
Map icon
TypeBossBurrowing Enemy
Max Life2,500,000 / 4,000,000 Expert Mode / 4,800,000 Revengeance Mode / 6,000,000 Master Mode / 7,200,000 Revengeance Mode Master Mode
KB Resist100%
Immune toRiptide (debuff)Crush DepthConfused
Cold Bestiary Cold.png-
Water Bestiary Water.pngResistant
Sickness Bestiary Sickness.pngVulnerable
Electricity Bestiary Electricity.pngVulnerable
Heat Bestiary Heat.pngResistant

The Primordial Wyrm is an hidden boss that is usually fought after defeating the Exo Mechs and Supreme Witch, Calamitas. The Primordial Wyrm spawns when the a player has the Chaos State debuff in the Abyss. While it can be spawned in any layer of the Abyss, it will enrage outside of the 4th layer. When enraged, the wyrm moves and spins faster, more projectiles and monsters are summoned, and projectiles are more predictive.

This guide will mention items exclusive to Expert and Revengeance Mode with no special formatting and will follow the intended progression.

Terrain Preparation

Unless fighting an enraged Primordial Wyrm, the large, empty 4th layer of the Abyss should prove to be a suitable arena. Stray blocks should be mined to avoid getting stuck in the middle of the fight.

Gearing Up


  • Auric Tesla armor has numerous benefits that make it the best option for many classes, especially for the revive it provides to Summoners and Mages.
  • Demonshade armor is preferable when using extremely damaging weapons, where defense matters less, or lifesteal, where the high offensive bonuses can offset the lower defensive properties.
    • The Demonshade armor's enrage ability can be used to massively increase DPS against the boss. However, this is very risky, as you will take more damage yourself, and the additional damage can easily be fatal.
  • Gem Tech armor can be a powerful option, but requires that you don't get hit much.



  • The Abyssal Diving Suit provides movement and defense buffs with protection from abyssal effects, making it a must have when fighting this enemy in the Abyss.


  • Drew's Wings or the Celestial Tracers are the preferred movement accessories for this fight. The former offers increased control and a higher flight time, while the latter provides increased speed and immunity frames.
  • The Asgardian Aegis or Statis' Void Sash allow the player to make sharp turns, which can be useful for dodging fast attacks.
    • The Asgardian Aegis additionally provides a ram and immunity to knockback.
    • Statis' Void Sash additionally provide a guaranteed ninja dodge every 90 seconds and increased jump acceleration.
  • The Exo Box is recommended in all situations.




  • The strongest weapons in the game are now available. Due to the Primordial Wyrm's heavy defenses, even most endgame weapons are not strong enough for this fight. Some of the available options are listed below.
  • While all weapons benefit from different enchantments, the Aflame enchantment provides a flat DPS boost that aids in the fight with minimal side effects.


  • On lower difficulties, Earth is an excellent weapon in this fight due to its piercing and its lifesteal, which only gets stronger when using Demonshade armor.
    • Earth also synergizes well with the bloodthirsty enchantment.
  • The Iridescent Excalibur is another option with longer range but lower DPS.
  • The Red Sun covers most of the screen and does high damage, and works well when kiting the wyrm up and down.
  • The Illustrious Knives are a powerful secondary weapon due to their homing and lifesteal.
  • The Exoblade can be used to hit the boss when it is far away, or in its last phase, due to its extremely high homing accuracy. However, due to its low DPS, switching to another weapon when it is close is advisable.


  • Contagion's high rate of fire makes it much better than most other endgame weapons for this fight.
  • The Heavenly Gale and Photoviscerator are the best homing options for this fight, but with lower DPS than other options.
  • The Voidragon is the best gun available.
  • God Slayer Slugs should be used with guns, while Bloodfire or Vanquisher Arrows should be used with bows.
  • The Resentful enchantment is good for keeping some distance between the player and the Wyrm while firing.
  • Tyranny's End is a powerful choice if you max out critical strike chance, but it has a low fire rate.


  • The Rainbow Party Cannon takes a while to charge up and has fixed aim, but its homing blasts can do immense damage when they catch up to the head.
  • The Eternity is a very powerful option that can lock on to the head and deal large amounts of damage.
  • The Oblatory enchantment is useful in this fight as the weapon can kill the Wyrm fast enough for the life drain not to matter.


  • The Universe Splitter is an extremely powerful option, but can only be used periodically.
  • The Profaned Soul Crystal turns all other weapons into powerful summoning-damage attacks. The fireballs created by holding a ranged weapon are especially effective.
  • The Endogenesis is versatile as well as very powerful.
  • The Metastasis and Cinders of Lament are risky but powerful options.
  • The Vigilance is a very powerful option.
  • The Hellbound enchantment works well with all summons.


  • The Scarlet Devil's stealth strikes can do steady damage to the head.
    • The Resentful enchantment can provide a DPS boost.
  • The Nanoblack Reaper can be used for stealth strikes or spamming.


  • The Glorious End can be used to gain immunity frames which can help to avoid damage, despite being an early Hardmode weapon.

The Fight

The Primordial Wyrm is an aerial worm-like enemy with 42 segments in total. Its body and tail segments can neither take damage nor deal contact damage, allowing the player to focus on just the head and projectiles.

It performs a variety of attacks on a cycle, which changes slightly based on each phase transition. When transitioning between phases, the wyrm will choose the next attack in its next phase's cycle. Upon contact with the head, the player is inflicted with the Crush Depth debuff for 10 seconds.

In Normal and Expert Mode

The wyrm has 6 total phases.

Throughout the fight, it rotates between a variety of attacks. At first, these include:

  • Teleporting, charging the player, then fading away and repeating the charge three times total. Dashes can help dodge this attack. This is the most common attack, and alternates between the others.
  • Summoning lightning bolts. These do enormous damage and are somewhat predictive. Moving carefully in a perpendicular direction to the bolts can help.
  • Summoning an Eidolon Wyrm (the smaller kind that usually spawn in the abyss). This is a great time to land hits, as it doesn't attack during this time.
  • Summoning ice mists in a pattern like the lightning bolts.
  • Summoning an Eidolist.

As the wyrm's health decreases, attacks are replaced with stronger ones:

  • At 80% health, some charges are replaced with a spinning attack where Ancient Light and Shadow Fireball projectiles are released.
  • At 60% health, another charge is replaced with an attack releasing Ancient Doom and Prophecy's End projectiles.
  • At 40% health, the final charge attack is replaced by a teleport attack that summons a wall of lightning bolts.
  • At 20% health, the summoning attacks are replaced by charges.
  • At 5% health, all attacks are replaced by a combination of the spin attack and the Ancient Doom projectiles.

In Revengeance Mode

  • Moves and charges faster with a greater predictiveness.
  • Lightning bolts and Ice Mists travel faster.
  • Ancient Dooms spawn closer to the player.
  • Takes less time to perform most attacks excluding Lightning Rain and Ice Mist Barrage attacks.
  • Summons more Eidolists, Ancient Dooms, and lightning bolts during the Lightning Charge attacks.

In Death Mode

  • Moves and charges faster with a greater predictiveness.
  • Lightning bolts and Ice Mists travel faster.
  • Ancient Dooms spawn closer to the player.
  • Takes less time to perform most attacks excluding Lightning Rain and Ice Mist Barrage attacks.
  • Summons more Eidolists, Ancient Dooms, and lightning bolts during the Lightning Charge attacks.

General Tips

  • When using a close range weapons, it can be useful to 'chase' the head, remaining close, as the body itself does no contact damage. Long range weapons benefit from swimming swiftly up or down, kiting the Wyrm behind you.
  • Be careful not to swim too high, as the wyrm enrages in the 3rd layer of the Abyss and higher.