Grotto Survey Guide

Grotto Survey Event Guide for Arknights: Endfield. Learn the Grotto Survey event overview, participation requirements, and the full list of Grotto Survey rewards in AKEF.

Grotto Survey Overview

Grotto Survey Event Period

The "Delver of the Cryptic – Grotto Survey" is a permanent Puzzle Event where you will explore and clear various Protocol Spaces.

Use Liquid Jets to Reach the Goal

In this event, you'll use gimmicks that spray water and Liquid Xiranite to reach your goal. There is virtually no combat, allowing you to enjoy the experience without needing to level up your characters.

Main Rewards: Oroberyl and Mark of Perseverance

The primary rewards for the Grotto Survey are Oroberyl and Mark of Perseverance. You will also earn a large amount of character upgrade materials, including T-Creds and Protohedrons.

Full List of Grotto Survey Rewards

Total Grotto Survey Rewards

Grotto Survey Total Rewards	Oroberyl x1200 T-Creds x174,000 Advanced Cognitive Carrier x12 Mark of Perseverance x6 Protohedron x54 Arms INSP Set x24

In Grotto Survey, each stage offers first-clear rewards and rewards for opening resource crates. The list above represents the sum of all rewards from every stage.

First Clear Rewards for Each Stage

First-Clear Rewards	Oroberyl x200 T-Creds x20,000 Advanced Cognitive Carrier x2 Mark of Perseverance x1 Protohedron x6 Arms INSP Set x4

The first clear rewards are consistent across all stages and difficulties.

Resource Crate Rewards

Resource Crate Rewards	T-Creds x3,000 Elementary Cognitive Carrier x4 Protohedron x1 Arms INSP Kit x4

You can obtain these rewards each time you open a resource crate. There are a total of 18 resource crates in the Grotto Survey.

Arknights: Endfield Event Articles

Cleanse and Rinse Until Apr 19, 2026 04:00 AM (UTC -5)	Monumental Etching: Scorch Mark Until Next Version Update
Delver of the Cryptic Permanent Event	Grotto Survey Permanent Event

Narrative Events

The Red Knight

[Event Period] Until Next Version Update [Main Rewards]