|Knockback||1.50 (Extremely Weak)|
|Use time||30 Average|
|Tooltip||Fires a string of bouncing sound waves|
Sound waves fired later in the chain deal more damage
Sound waves echo additional sound waves on enemy hits
Sound waves deal more damage the more they pierce
|Inflicts Debuff||Crush Depth|
|Debuff duration||10 seconds (Small and Main waves)|
|Debuff tooltip||Aquatic pressure|
|Debuff duration||5 seconds (Main wave)|
|Debuff tooltip||Defense reduced by 20|
|Debuff duration||10 seconds (Main wave)|
|Debuff tooltip||You cannot move|
The Hadopelagic Echo is a craftable post-Moon Lord magic gun that is a direct upgrade to the Eidolic Wail. It fires five sound waves that can ricochet off of walls in quick succession. The second, third, fourth, and fifth sound waves deal additional damage and all sound waves deal increased damage the more they pierce. They also echo when hitting enemies, creating four extra sound waves around the enemy. After hitting an enemy they slow down and fade. The sound waves ignore NPC immunity frames, dealing constant damage to any enemies they touch, and inflict the Crush Depth debuff.
Its best modifier is Mythical.
- The weapon's sprite was originally intended to be a resprite of the Eidolic Wail.
- The weapon has a 1% chance of playing the Sunskater death sound instead of the typical sound.