Giant Clam

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Giant Clam
Giant Clam.png
EnvironmentSunken Sea
DamageThis attack will cause defense damage on hit. 50 / 100 Expert Mode / 120 Revengeance Mode / 132 Death Mode / 150 Master Mode / 180 Revengeance Mode Master Mode / 198 Death Mode Master Mode (pre-Hardmode)
This attack will cause defense damage on hit. 100 / 200 Expert Mode / 240 Revengeance Mode / 264 Death Mode / 300 Master Mode / 360 Revengeance Mode Master Mode / 396 Death Mode Master Mode (Hardmode)
70 / 112 Expert Mode / 140 Revengeance Mode / 161 Death Mode (Psychic pearls)
Max Life1250 / 2500 Expert Mode / 3750 Master Mode (pre-Hardmode)
7500 / 15000 Expert Mode / 22500 Master Mode (Hardmode)
Defense9999 (closed)
10 (open in pre-Hardmode)
35 (open in Hardmode)
KB Resist100%
Inflicts debuffClamityClamity
100% chance
Debuff durationInfinite (While aggressive)
Debuff tooltipThe clams have been angered!
Immune toConfusedPearl AuraSlowEutrophication
Coins1 Gold Coin (pre-Hardmode)
8 Gold Coin (Hardmode)
Giant Clam map.png
Map Icon

A specimen which has developed a grand size, and inexplicably, impressive psychic abilities.

Draedon's Log - Study on Sunken Aquatic Life

The Giant Clam is a mini boss that rarely spawns in the Sunken Sea after defeating the Desert Scourge, and is generally the first mini boss that the player will encounter. It receives a huge buff during Hardmode. It is initially passive and closed up, but once the player hits it 5 times, the player receives the Clamity debuff, which boosts the spawn rate of Clams and making them aggressive while reducing the other enemies' spawn rate to 0, and the Giant Clam becomes aggressive.

While mostly immobile, it can perform one of 2 moves every 4 seconds. Its most common move is to teleport over the player's head and fall down on them. The other, less common move is to close itself up for a short while, then spawn 3 more Clams.

In Hardmode, it gains 2 new attacks which have a timer of 3 seconds, unrelated to its primary attacks, on top of making its tele-stomp attack faster. Its first attack is to shoot a ring of 6 psychic pearls along with another faster pearl that is always aimed towards the player. Its second attack is to summon a rain of 11 psychic pearls upon the player, which have a gap between them.

It will drop the Sea King if he is not already present in the world and the Desert Scourge has been defeated already. Additionally, Sunken Crates will include Giant Clam's weapons in Hardmode after it has been defeated.

It can be detected with the Lifeform Analyzer.


Image Name
Clam Clam


  • The BestiaryBestiary entry for the Giant Clam: "This oversized clam is large enough to entrap a person or two whole. Thankfully, it has only taken turf in the lowest regions of the sunken sea."
  • The Clamity debuff name is a portmanteau of the word "clam" and the mod's title, "Calamity."
  • The Giant Clam has a Draedon's Log entry dedicated to it that can be found in the Sunken Sea Bio-center Lab.
  • If the Boss Checklist Mod is installed, its unique despawn message will be "The Giant Clam returns hiding in its grotto."