Blood Squid

Type	Flying Enemy
Environment	Blood Moon
AI Type	Flying AI
Damage	60/120/180 (contact); 70140210 (Blood Shot)
Max Life	750/1500/2250
Defense	16
KB Resist	100%
Banner	Blood Squid Banner(Desktop, Console and Mobile versions)
Immune to
Coins	5 SC12 SC50 CC
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_1.wav
Blood Shot	https://terraria.wiki.gg/wiki/File:Item_171.wav

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

The Blood Squid is a flying Hardmode enemy summoned by the Dreadnautilus during a Blood Moon. It resembles a regular Squid, but is larger, redder-colored, and has multiple eyes on its body, similar to the Drippler. The Dreadnautilus always summons Blood Squids in groups of three.

The Blood Squid attempts to close in on the player before firing a single red Blood Shot projectile at the player, similar to the Dreadnautilus's own Blood Shots, but with higher damage. Like the Dreadnautilus, it recoils after each shot. The shots are inaccurate, which means that its shots could miss even if the player is standing still.

Trivia

Despite being a squid, water will still slow down its movement.
The Blood Squid's anatomy resembles that of a vampire squid, small deep-sea cephalopods native to temperate and tropical oceans at extreme, lightless depths.
The Blood Squid has its own banner, unlike most other summoned enemies like Shadowflame Apparitions, Baby Slimes, Slimelings, and Chattering Teeth Bombs.

The Bestiary entry for the Blood Squid: "Summoned in small groups by the Nautilus to aid their master in battle. Thick are the streams of blood squirted from their bodies."