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Anomaly El Dorado Guardian (Custos Mutation) event guide for Mongil: Star Drive. Guide includes event details, how to accept request, rewards, El Dorado Monsterling, how to unlock, and more.
Table of Contents
Anomaly: El Dorado Guardian Overview
Event Details
| Requirements | Complete Episode 5: A Worthy Divine Maiden |
| Duration | April 22, 2026 12:00 AM – May 5, 2026 11:59 PM (UTC) |
| Rewards |    |
The Anomaly: El Dorado Guardian is an event wherein through a request, you will be able to fight a Mutation of the Custos. Defeat the El Dorado Guardian to earn rewards, as well as it's own Monsterling.
Advance the Main Quest to Unlock
If the El Dorado Guardian event is inaccessible to you, you will have to advance further through the story. By the time you complete the main story, the El Dorado Guardian will not be as challenging to fight anymore.
| Story Quest Walkthrough | ||
| Episode 1 | Episode 2 | Episode 3 |
| Episode 4 | Episode 5 | |
How to Complete Anomaly El Dorado Guardian
- Go the Request Board
- Accept the Request on the Event Tab
- Head to the Location & Defeat It
- Turn It In to Lenna
- Repeat Once Server Resets
Go the Request Board
The Anomaly El Dorado Guardian functions similar to that of a regular Request. Head to the Request Board and accept it.
Accept the Request on the Event Tab
The Anomaly Request can be found in the Events tab. It's entirely separate from the normal Requests.
Does Not Count in Daily Request Cap
The Anomaly Request will not count towards your 5 Request limit per day. You can complete it, then proceed to do your regular 5 Requests after.
Head to the Location & Defeat It
The El Dorado Guardian is located in the Warden's Respite. It's level 60, but is not quite different from the usual Custos.
Turn It In at the Hub
After defeating the El Dorado Guardian, go to Lenna at the hub to turn it in. She will then give you the rewards for completing it!
Repeat Once Server Resets
The Anomaly El Dorado Guardian can be done once a day. The attempt refreshes every day during Server Reset. In total, you can fight it up to 14 times before the event expires!
How to Capture El Dorado Monsterling
High Level Nyanners
Capture proficiency is directly tied to your Nyanners' level. It's recommended that you aim to keep leveling up your Nyanners as you do this event. Ideally, be on max level for the highest chance of getting Monsterlings.
Eat Damp Forest Soup
Damp Forrest Soup increases Capture Proficiency, increasing the chance to get a Monsterling. Eat one prior to challenging the El Dorado Guardian to increase your chances.
How to Cook and Recommended Recipes
Anomaly El Dorado Guardian Rewards
Obtain Items as Rewards
| Request Rewards (1 per run) |    Starlight Crystal ×15Cord of Fate ×1Perfect Growth Chow ×1 |
You get a set amount of items every time you complete the Request. This is per day so you can accumulate up to 14 days worth of it by doing it every day.
Low Chance to Get El Dorado Monsterling
The El Dorado Guardian is a mutation of the Custos and will normally require a complex Combining process to get it. In this event, you have a chance of getting it by defeating the El Dorado Guardian. However, it only has a 5% chance of droppping.
El Dorado Guardian Monsterling
Get Custos Materials
Defeating the El Dorado Guardian can also net you some Custos materials. Since you need this material to eventually be able to craft the El Dorado Guardian though Link Chains, it's recommended that you keep at least one of it.
Link Chain Guide & Best Monsterlings
Best Character Tier List
Reroll Tier List
How to Reroll Guide
Raising Adventure Level
Character Progression
Role and Classes
Recommended Gachas
Game Difficulty Guide
How to Cook and Best Recipes
How to Capture Monsters
How to Solve Oz's Puzzle
Is Mongil a Gacha Game?
How to Farm Starlight Crystals
