Terraria Wiki → Sky Towers (boss or event?)
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Image taken from terraria.fandom.com.
Option 1 (Expert mod)
You need:
The best armor that suits your class and is available to you now.
The best weapon you have.
Shiny stone
3-5 large healing potions.
Wings
Reforge all axes to +3-4 defense.
You can take:
Potion of iron skin, stamina, regeneration.
Vampire knives
Combat:
Enter the part of the tower's biome where the color of that biome appears, stand there for 3 seconds, then exit and smash the mobs that fly in. Repeat this until the jets of water flying at the tower when killing mobs stop appearing if the tower has a shield.
When they stop appearing, run to the tower and hit it with everything you have. If you're killed, return to the tower and finish it off.
Option 2
First, you'll need to destroy the Vortex Tower.
You'll need:
Beetle Armor (requires Chestplate)
Vortex Cannon
Approximately 1000 chlorophyte cartridges
Large healing potions (3-4 pieces)
Potion of Iron Skin, Potion of Regeneration, and possibly a Potion of Ichor
UFO Pet (falls from a flying saucer in Martian Madness)
Ice Hydra Staff
Star Cage Staff (optional, if possible)
The tactics themselves:
We fly up to the area with the tower, take off about 100 meters from the ground, as the first monsters appear, we fly up about 50 blocks and shoot down with chlorophyte bullets, fly up to the tower across the map and start flying in circles, dodging fire projectiles and waiting for the Crawlers (they appear most often when a tower appears on your screen).
As soon as the Crawler flies up to you, fly under its belly and shoot towards its tail (the bullets will automatically aim where they need to be and destroy the worm in a matter of seconds). Quickly fly up to the tower and place the Hydra at its foot; it will shoot at the mobs, and at the right moment, it will start shooting at the tower. Fly in circles above the tower and shoot at the mobs. As soon as the shield falls, fly to the tower (preferably, it should be at the very bottom of the screen) and fly in circles again, shooting downwards.
The gist of why this is exactly:
The most important thing is Chlorophyte bullets. I personally spent about 800 when I destroyed the remains of the tower and then spent about 150-200 on the remaining mobs. The bullets automatically aim at priority mobs (those closest to you) + the Hydra tower will deal a lot of damage to you, which can also be upgraded (enchanted).
Option 3
1. The tactics are very simple and don't require any special skill. You'll only need patience.
2. We'll need:
Armor absolutely ANY (I went without);
Mini or Mega Shark, and more than 400 rounds of ammunition for it, preferably silver cartridges, but if money is tight, musket cartridges will do;
Fire and lamp with heart;
There are two mandatory accessories: Depth Gauge and Damage Counter. While the former is required, the latter is possible, but you'll need to die once. Otherwise, any accessories are fine, but preferably something offensive with a good prefix.
HP to your taste, but the more the better.
And, as I said earlier, patience.
3. Here's the tactic itself: dig under any biome and fight the monsters there, set up a campfire and a lamp, and get to work. If you want to do this with the Shark, buy more ammo. Continue this way until you reach 100, or 150 if you're on Expert mode. After you find out the shield is gone (souls aren't flying out of mobs), head to a plain at an altitude of 120-140 (all my towers were at 134, so it's best to double-check—even if you die, it'll be faster). When you're 100% sure you're at the right altitude, shoot horizontally at the tower, even if you're not in the biome.
Option 4
This tactic works on all towers (except the solar one).
You'll only need two items. No potions or axes.
We'll need the Influx Sway or Terra Sword and the Space Car Key. Since the UFO flies indefinitely and the swords it fires don't consume mana, we simply fly the UFO around the towers and use the swords to shoot mobs, and then the tower itself. Personally, I destroyed all three towers without dying, even with 100 HP, no armor, and no Axes.
Source: steamcommunity.com
See also: