Cthulhu

He is in terraria!

 is a fictional cosmic entity originally devised by author, as an evil god from beyond the human universe. The creature remains a popular element of today.

Cthulhu was a possible boss. Re-Logic was considering its addition at one point. While, a number of enemies and items include direct and indirect references to Cthulhu.

While we never see Cthulhu we do know some things about him from his organs. Cthulhu has blue eyes. (Unless he has Heterochromia iridum). He has a heart located in his brain.

Trivia

 * In the concept art, he is missing one of his eyes, presumably because the missing eye became the Eye of Cthulhu boss.
 * One of the title messages on the refers to this: ""

克苏鲁