Getting the Undyne spec/weapon in Legacy Piece takes several steps, so you cannot unlock it right away. You first need to complete Undyne’s challenge, collect the required materials, defeat the boss, and have the correct race. If you are planning to unlock Undyne, this guide explains the full process in a simple order.
Undyne Spec Requirements
Before selecting “Learn Undyne,” make sure you have everything required. The main requirements are:
- Undead Fishman race
- $100,000,000
- 1 Undyne Core
- 100 Undying Souls
Once you have all of them:
- Return to Undyne.
- Talk to her.
- Select “Learn Undyne.”
- The required money and materials will be consumed.
- You will then receive the Undyne spec.
The $100 million requirement is the biggest part of the process, so make sure you have enough money before starting the final unlock.
How to Get the Undyne Spec in Legacy Piece
The first thing you need to do is find Undyne and start her challenge. Follow these steps:
- Talk to Undyne.
- Select “Accept Undyne’s challenge.”
- Complete the spear-blocking minigame for 30 seconds.
- Use WASD or the Arrow Keys to rotate your shield and block the incoming spears.
- Press R if you want to retry the minigame.
- Press Esc if you want to leave the challenge.
- After surviving for 30 seconds, talk to Undyne again.
- Choose “Begin Soul Resonance.”
- Search for the three hidden energy spears.
- Interact with each spear to activate it. Each spear only counts once.
- Return to Undyne after finding all three.
- Select “Challenge Undyne.”
- Enter the Ocean Cave trial and defeat Undyne.
After beating her, you still need to meet the requirements before you can learn the Undyne spec.
How to Get the Undead Fishman Race
The Undead Fishman race is also required for Undyne, meaning you need to complete another progression path first. Start with the Fishman race, then complete its evolution quest. You need to defeat 5 Fishman Captains and collect 3 Undead Fishman Scales. After completing the evolution quest, prepare these materials:
- 20 Undead Fishman Scales
- 5 Undead Fishman Cores
- 100 Dreadtide Fangs
- 50 Dreadtide Hearts
Once you have the required items, complete the race evolution process to obtain the Undead Fishman race.
How to Farm Undyne
After defeating Undyne for the first time, you do not have to repeat the entire challenge whenever you want to fight her again. You can use the Undyne Summon NPC to farm the boss. Each Undyne summon requires:
- 50 Boss Tickets
- $50,000
Undyne currently has a 5% chance to drop 1–5 Undying Souls. Because of the low drop chance, you may need to defeat her several times if you are farming Undying Souls for the Undyne spec or other purposes.
Legacy Piece Undyne Guide Tips
The easiest way to handle this unlock is to work on the requirements separately. First focus on getting the Undead Fishman race and farming the materials needed for it. After that, work toward the $100 million requirement while collecting the Undyne materials.
The spear minigame is also worth practicing because you need to survive for 30 seconds before continuing the quest. Keep your shield moving with the WASD or Arrow Keys and focus on blocking the incoming attacks rather than rushing through the section.
Once you have defeated Undyne and collected everything required, return to her and use “Learn Undyne” to finish the process.
That is the full process for obtaining the Undyne spec in Legacy Piece. The main requirements are the Undead Fishman race, $100 million, 1 Undyne Core, and 100 Undying Souls. The process can take some time because of the boss fights and low Undying Soul drop rate, but preparing the materials ahead of time will make the final unlock much easier.