How do I summon the Old One's Army event in Terraria?

To summon the Old One's Army event in Terraria, you need to interact with the Eternia Crystal Stand, which is the central mechanic of this event. The Old One's Army is a unique wave-based defense event where you must protect the Eternia Crystal from waves of enemies. This event is tied to the Tavernkeep NPC, who provides access to the Eternia Crystal and related items. HereÔÇÖs a detailed guide on how to summon and prepare for the Old One's Army event.

First, you need to find the Tavernkeep NPC. The Tavernkeep can spawn randomly in the world after you defeat the Eater of Worlds or Brain of Cthulhu. Once you encounter him, he will move into a suitable house if you have one available. The Tavernkeep sells the Eternia Crystal Stand and Eternia Crystals, which are essential for summoning the event. The Eternia Crystal Stand costs 25 gold, and the Eternia Crystal costs 1 gold. You will need both items to start the event.

To summon the Old One's Army, place the Eternia Crystal Stand in a flat, open area. The event requires a large space, so make sure the area is clear of obstacles and has enough room for combat. Once the stand is placed, right-click it with an Eternia Crystal to start the event. The event consists of multiple waves, and each wave increases in difficulty. The goal is to protect the Eternia Crystal from being destroyed by the incoming enemies.

Preparation is key to succeeding in the Old One's Army event. Before starting, ensure you have strong weapons, armor, and accessories. The event is divided into tiers based on your progression in the game. Tier 1 is available pre-Hardmode, Tier 2 is available after defeating any Mechanical Boss, and Tier 3 is available after defeating Golem. Each tier introduces stronger enemies and more challenging waves, so make sure your gear matches the tier you are attempting.

For Tier 1, weapons like the Minishark, Star Cannon, or any strong melee weapon like the Night's Edge are effective. For Tier 2, weapons like the Megashark, Daedalus Stormbow, or Onyx Blaster are recommended. For Tier 3, endgame weapons like the Terra Blade, Solar Eruption, or Vortex Beater are ideal. Armor sets like Molten Armor for melee, Meteor Armor for magic, or Necro Armor for ranged are good choices for Tier 1. For Tier 2, Adamantite or Titanium Armor is recommended, and for Tier 3, use Chlorophyte or Beetle Armor.

Building a proper arena is crucial for the Old One's Army event. Create a flat platform with enough space to move around and dodge attacks. Place traps like Dart Traps or Flame Traps to help deal with enemies. Lava pits can also be effective, but make sure they donÔÇÖt interfere with your movement. Use blocks to create barriers that funnel enemies into specific paths, making it easier to focus your attacks.

During the event, prioritize enemies that target the Eternia Crystal directly. Some enemies will ignore you and go straight for the crystal, so keep an eye on them. Use area-of-effect weapons to deal with groups of enemies quickly. Summoning minions or using sentries from the TavernkeepÔÇÖs inventory can also help manage the waves. Sentries like the Ballista or Explosive Trap are particularly useful for dealing consistent damage.

One common mistake is underestimating the difficulty of higher tiers. Make sure you are well-prepared with the best gear available for your current progression. Another mistake is not having enough space for the event. The Old One's Army requires a large area, so clear out a significant portion of the world to avoid being overwhelmed.

Advanced techniques include using buffs like Ironskin, Regeneration, and Swiftness potions to enhance your combat effectiveness. Additionally, using heart statues or honey pools can provide extra healing during the event. For ranged and magic classes, mana regeneration items like the Mana Flower or Celestial Cuffs are essential.

In summary, summoning the Old One's Army involves purchasing the Eternia Crystal Stand and Eternia Crystal from the Tavernkeep, placing the stand in a suitable area, and activating the event. Preparation is crucial, so ensure you have the right gear, build an effective arena, and use buffs to enhance your performance. By following these steps and strategies, you can successfully defend the Eternia Crystal and earn valuable rewards from the Old One's Army event.