How do I build a base that is resistant to Old One's Army events in Terraria?

Building a base resistant to the Old One's Army event in Terraria requires careful planning, as this event involves waves of powerful enemies attacking a central point, the Eternia Crystal. The goal is to protect the crystal while fending off enemies. HereÔÇÖs a detailed guide to help you create a base that can withstand the event.

First, understand the mechanics of the Old One's Army. The event occurs when you place an Eternia Crystal on an Eternia Crystal Stand. Enemies will spawn from both sides of the map and attempt to destroy the crystal. The event has multiple tiers, with each tier increasing in difficulty. Your base must be designed to handle these waves, especially in higher tiers like Tier 3, which includes powerful bosses like Betsy.

To start, choose a flat area for your base. The Old One's Army event requires a wide, open space, so clear out any obstacles. The Eternia Crystal Stand should be placed in the center of this area. Around the stand, build a platform or arena with multiple layers. These layers will allow you to move vertically and attack enemies from above or below. Use platforms or solid blocks for these layers, but ensure there are gaps to shoot through.

Next, focus on defense. Build walls or barriers on both sides of the crystal to slow down enemy movement. These barriers should be made of strong blocks like stone or dungeon bricks. Leave small openings in the barriers to attack enemies while keeping them at a distance. You can also place traps like spear traps, flame traps, or spiky ball traps near the barriers to deal damage to enemies as they approach.

For added protection, consider using lava moats. Dig shallow trenches on both sides of the crystal and fill them with lava. Enemies will take damage as they walk through the lava, but be careful not to place the lava too close to the crystal, as it can destroy dropped items or harm you.

NPC placement is another important factor. NPCs can help defend your base, but they can also be targeted by enemies. Place NPCs in safe areas, such as elevated platforms or behind walls, where they can attack enemies without being overwhelmed. Summoner NPCs like the Tavernkeep can provide additional support by summoning sentries.

Resource management is crucial. Gather materials like stone, wood, and traps before starting the event. YouÔÇÖll also need weapons, armor, and potions. For weapons, choose ones with high damage and range, such as bows, guns, or magic spells. Armor should provide good defense and bonuses to your chosen class. Potions like Ironskin, Regeneration, and Swiftness can give you an edge in combat.

Class and equipment considerations are vital. Each class has strengths and weaknesses in the Old One's Army event. Melee classes can tank damage but may struggle with ranged enemies. Ranged classes excel at taking out enemies from a distance but are more vulnerable up close. Magic classes deal high damage but require mana management. Summoners can use minions to distract enemies but need to stay mobile. Choose a class that suits your playstyle and equip accordingly.

Advanced techniques include using actuators to create retractable barriers. This allows you to open and close pathways, controlling enemy movement. You can also use teleporters to quickly move between layers of your base, giving you an advantage in combat. Additionally, consider using heart statues and star statues wired to timers to provide health and mana regeneration during the event.

Common mistakes to avoid include placing the crystal in an unprotected area, using weak materials for barriers, and neglecting to prepare enough resources. Another mistake is not having a backup plan if enemies break through your defenses. Always have an escape route or secondary defense layer.

In summary, building a base resistant to the Old One's Army event requires a combination of strategic planning, resource management, and combat readiness. Focus on creating a multi-layered arena with strong barriers, traps, and NPC support. Prepare your character with the right equipment and potions, and use advanced techniques like actuators and teleporters to optimize your defense. By following these steps, you can successfully protect the Eternia Crystal and defeat the Old One's Army.