How do I farm for the Last Prism in Terraria?

Farming for the Last Prism in Terraria is a challenging but rewarding task, as it is one of the most powerful magic weapons in the game. The Last Prism is dropped by the Moon Lord, the final boss of Terraria, with a 11.11% drop rate. To farm for this weapon, you will need to repeatedly defeat the Moon Lord, which requires careful preparation, strategy, and resource management. Below is a detailed guide to help you efficiently farm for the Last Prism.

First, you need to understand the mechanics of summoning and defeating the Moon Lord. The Moon Lord is summoned either by defeating the Lunatic Cultist and the four Celestial Pillars (Solar, Nebula, Vortex, and Stardust) or by using a Celestial Sigil, which is crafted from 20 Solar Fragments, 20 Nebula Fragments, 20 Vortex Fragments, and 20 Stardust Fragments. The Celestial Sigil method is more efficient for farming, as it allows you to skip the Celestial Pillars phase and directly summon the Moon Lord. To craft the Celestial Sigil, you will need to defeat the Celestial Pillars at least once to gather the required fragments.

Preparation is key to successfully farming the Moon Lord. You will need a well-equipped character, a suitable arena, and a variety of buffs and potions. For a magic-focused build, which is ideal for using the Last Prism, you should aim for high mana and damage output. Equip armor such as Spectre or Nebula armor, which provide significant magic bonuses. Accessories like the Celestial Emblem, Sorcerer Emblem, and Mana Flower will enhance your magic damage and mana efficiency. The Celestial Cuffs or Mana Regeneration Band can help with mana regeneration, while the Wings and Master Ninja Gear will improve mobility and survivability.

Your arena should be designed to maximize mobility and minimize damage taken. A long platform with multiple layers of wooden platforms is ideal, allowing you to dodge the Moon Lord's attacks more easily. Place Heart Lanterns, Campfires, and Honey pools around the arena to boost health regeneration. Additionally, consider using traps and sentries to deal extra damage, though they should not be your primary source of damage.

Buff potions are essential for increasing your combat effectiveness. Use potions like Magic Power, Mana Regeneration, Endurance, Ironskin, and Lifeforce to boost your stats. The Well Fed buff from food items like Cooked Fish or Pumpkin Pie will also provide a small but useful increase to your overall performance. If you are playing in Expert or Master Mode, the Worm Scarf or Brain of Confusion can provide additional damage reduction or evasion.

During the fight, focus on dodging the Moon Lord's attacks while dealing consistent damage. The Moon Lord has three main parts: the head, hands, and core. Start by targeting the hands, as destroying them reduces the damage you take from their attacks. Once the hands are down, focus on the head, and finally the core. The Last Prism is a beam weapon that consumes mana rapidly, so use it strategically. Activate it when the Moon Lord is vulnerable, and deactivate it when you need to regenerate mana or dodge attacks. The Nebula armor's set bonus can help replenish mana and health during the fight.

Common mistakes to avoid include underestimating the Moon Lord's damage output and failing to manage your mana effectively. The Moon Lord's attacks can deal massive damage, especially in Expert or Master Mode, so always prioritize dodging over dealing damage. Additionally, running out of mana at a critical moment can leave you vulnerable, so keep an eye on your mana bar and use mana potions or the Mana Flower's auto-use feature.

Advanced techniques include using the Rod of Discord to teleport out of dangerous situations, though this requires precise timing and can be risky due to the Chaos State debuff. Another optimization is to use the Nurse NPC to heal during the fight. Place the Nurse in a house near your arena and quickly teleport to her using a Magic Mirror or Recall Potion when your health is low. This can save you from death and allow you to continue the fight without restarting.

In summary, farming for the Last Prism involves repeatedly defeating the Moon Lord with a well-prepared magic build, a strategic arena, and the right buffs and potions. Focus on dodging attacks, managing your mana, and dealing consistent damage to the Moon Lord's parts. With patience and practice, you will eventually obtain the Last Prism and wield one of the most powerful weapons in Terraria.