Why won't Eye of Cthulhu spawn?

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When I used the suspicious eye to summon Eye of Cthulhu at night, he wouldn't spawn. Is it a bug or do I need to do anything else? I have full health in red hearts, 13 defense, and I'm using a tungsten broadsword.
Best Answer
You can spawn Eye of Cthulhu with a Suspicious Looking Eye only if all of the following conditions are met:
- It's nighttime (you should summon it at nightfall anyway since it will disappear at dawn)
- It's not raining
- You are not fighting a summoned Eye
Your item won't be consumed otherwise and nothing in particular will happen.
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How do you trigger the eye of Cthulhu?
How To SummonHow do you get the eye of Cthulhu spawner?
The Eye Of Cthulhu is easy to spawn. You just need 6 Lens, which can be farmed from the smaller eyes that spawn during a regular night. Take those Lens to a Demon Altar or Crimson Altar and craft the Suspicious Looking Eye. Make sure to start the fight at around 7:30 PM in-game time.Does it have to be night to summon the eye of Cthulhu?
The Eye of Cthulhu can only be summoned during night-time and will disappear without dropping any loot if the player does not kill it before daytime. Therefore, the best time to summon this monster would be soon after nightfall. That way, you'll have all night to defeat it.LICD: Why Won't She Leave
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Answer 2
Have you defeated the Cthulhu before?
When I try to spawn bosses, I always make sure that I have defeated them before first.
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