Blood Moon, Battle Potion, and a water candle placed. Is there any other way or do any of these work by adding more? (more players using battle potion, or more water candles on the screen)
Terraria – stack more spawn rate enhancement(s)
terraria
Related Solutions
Yes. Water Candles increase the monster spawn rate by 33% and increase the maximum number of spawned monsters by 50% when it's placed near you, or you're actively holding it. Merely having it in your inventory doesn't do anything.
The Water Candle was broken before the 1.0.4 update, though; its effect was instead attributed to the Band of Regeneration. This is no longer the case.
Baseline answer: A mob (evil NPC) must be standing on the same level as the door to open the door.
Mobs can jump but will generally only do a large jump if the player is near by. So while it may be possible for them to do so, it is not entirely likely. The thing I would be concerned about is when the monsters spawn on the ledges because you just happen to be standing at the right spot to make it a valid spawn location. Putting in good NPCs will help with this a bit, but its still a concern.
Here is a picture of my last base (well, two towers out of it, it expands more to the left with a couple more buildings). All the doors seen in the picture are mob safe, they are up one block from the standing level the mob will be on, and there is nothing for the mob to jump to as long as the door is closed. There is one weak spot on the right hand tower, if you look at the internal doors on the right side of it, they are on the level with the flooring.. So if a mob can get through the lower right hand door (which is offset properly mind you) then they can jump to to any level and start running havoc!
Hope this helps!
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Best Answer
The Jungle has an increased spawn rate. There's a chart here showing the spawn rates, and it shows that the Jungle during a Blood Moon has a 1-in-60 chance of a monster spawning every 'tick', compared to 1 in 108 during Blood Moon in other biomes.
The Jungle also has the highest spawn limit, with a limit of 15 mobs during a Blood Moon, vs. 11 in other biomes.