What is the Blood Moon in Terraria?

The Blood Moon is rising… Prepare yourself.

Have you been playing Terraria like any other typical day only for a strange occurrence to happen? The day went by smoothly like you would expect any different day cycle in Terraria to do so, but then night falls, and everything turns red. The Blood Moon has risen, basking the entire area in red and giving everything an eerie feeling. In the 1.4 update, the Blood Moon received some changes, so what you might have known before could be different now. Read on to learn the situation around the Blood Moon and what it means for you.

When does a Blood Moon happen?

Blood Moons have a decent chance of happening should the proper criteria be met. For an 11% chance that a Blood Moon will rise, at least one player in the server needs to have 120 health, and it needs to be any night where the moon is present (any night besides a new moon). Once started, the Blood Moon will last for the entire night cycle.

If you want to force a Blood Moon to happen, you will need to consume a Blood Tear at nighttime, dropped by various enemies that appear during a Blood Moon. Below is a breakdown of what enemies to kill for a chance at a Blood Tear, along with the percentage chance they will drop it.

  • Normal enemies, Blood Zombies, Clowns- 1%
  • Wandering Eye Fish, Zombie Merman, Blood Eel, Hemogoblin Shark- 4%
  • Groom, Bride- 20%
  • Dreadnautilus (Classic Mode)- 50%
  • Dreadnautilus (Expert or Master Mode)- 100%


During a Blood Moon, enemy spawns increase, even near NPCs, which generally would not have enemies spawning nearby. More will spawn than regular, and they will generate faster, so be ready for a fight. During this time, zombies can open doors, and usually peaceful creatures like rabbits, penguins, and goldfish will become corrupted or vicious versions of themselves, depending on the world, and hostile.

The Groom and Bride are both zombie variants with more health than your typical zombie and are dressed the part. As you would guess, a Blood Zombie is another zombie type, but with more health, damage, and speed buffs than you would see in a typical undead. It also gets faster the closer to a player it gets. Dripplers are flying enemies that slowly float towards the player. All four of these enemies will spawn via traditional means in the world; however, other enemies will appear during certain circumstances. In Hardmode, the Clown can spawn, an evil clown figure balancing himself on a big ball. He will throw bombs at you and can make you confused if you touch him.

Fishing, for example, will now have the chance to real in multiple new enemies. Using the Chum Caster will bring a better opportunity to reel in one of these monsters. Zombie Merman moves exceptionally fast while underwater, so after fishing it up, be sure to keep it from going back in the water. It also can not be knocked back and will have higher defense and health than a typical zombie. The Wandering Eye Fish is a small flying fish with a big eye. Like the Zombie Merman, it cannot be knocked back and will have high defense and health. However, while it is fast moving in the air, it is slower in the water.

When playing in Hardmode, three more enemies can be fished up during the Blood Moon, and one will summon another kind of enemy. The Blood Eel is a segmented enemy that acts like a faster Wyvern. Its head is its weakest area, so aim your attacks there. The Hemogoblin Shark is an apex predator both in the water and on land. It is fast; whether it is swimming or running, it can jump high, is immune to lava damage, and can fire Blood Shots at you when on land. Finally is the Dreadnautilus, the most dangerous of fished up enemies. This flying enemy has a few moves it can pull off, making it invincible, reflecting projectiles, or summoning Blood Squids, which we will get to in a second. Probably the best way to protect yourself while fighting one of these is to build a square structure, but even then, the Dreadnautilus can pass through walls and hit you, so be sure to be kitted with health items when trying to fight one. When Blood Squids are summoned, they will try to get close to you and fire projectiles. These are more meant to be a distraction from the Dreadnautilus itself, so if you have any summon weapons, let them focus on the Blood Squids while you focus on the big boss himself.


While you will likely have your hands full with fighting enemies during a Blood Moon, if you find yourself near an NPC, they could be selling items that can only be found during Blood Moons. Here are all of the items that can be purchased during the Blood Moon.

  • Throwing Knives – Merchant
  • Mime Mask, Fallen Tuxedo Shirt, Fallen Tuxedo Pants – Clothier
  • Tungston or Silver Bullets – Arms Dealer
  • Vile Powder, Corrupt Seeds or Vicious Powder, Crimson Seeds – Dryad
  • Bloodbath Dye – Dye Trader
  • Evil Presence painting – Painter
  • Purple or Red Solution – Steampunker
  • Rocket II ammunition – Cyborg
  • Slap Hand – Skeleton Merchant (Hardmode only)

Other noteworthy occurrences during a Blood Moon

The following are a collection of other interesting facts during the Blood Moon.

  • You cannot sleep to speed up a Blood Moon night.
  • While spawn rates increase in the world, they do not increase underground. Since the Blood Moon can not reach those areas, the monsters will remain normal down there.
  • Like during a full moon, the Zoologist will transform into their werewolf form during a Blood Moon.
  • The buff to spawn rates will stack on top of the effects gained from Battle Potions and Water Candles.
  • Even if you are coming out of a Blood Moon, there is an equal chance for it to happen the next night if the situation is correct.
  • Werewolves can appear during a Blood Moon on a night of a full moon in Hardmode.
  • Deathweed will only bloom during a Blood Moon, meaning you can cut it down to receive seeds during this time.
  • Placing a block in front of a door will keep zombies from opening it.