Cor Operation is an instance introduced in Episode 17.1. It focuses on suppressing the EL1-A17T and securing Elyumina. This guide will help you navigate and complete the instance efficiently.

• Must be part of a party
• Party leader must initiate the instance

To start the Cor Operation, follow these steps:

1. Location: Go to the starting point at 1@cor (177, 169) and speak with Elena Volkova.
2. Party Requirement: Make sure you're in a party; only the party leader can initiate the instance.

1. Talk to Elena Volkova. She will explain the operation and provide directions. 2. You will be assigned to suppress the EL1-A17T by clearing out various traps set by Elyumina’s minions. 3. Once the briefing is complete, Elena will open the portal to the mission area. Make sure your party is prepared before proceeding.

Once inside the Cor Operation instance, follow these objectives:

1. You will encounter suspicious boxes scattered across the map. These boxes trigger traps and summon monsters when interacted with.
2. Each box will spawn either Biological Batteries or Chemical Poisons that power the summoned monsters. You must destroy these devices to weaken the enemies.
3. Defeating the monsters and deactivating traps in all four locations will trigger the boss encounter with EL1-A17T.

1. Boxes and Traps:

1. Look for Rebellion NPCs who will guide you to suspicious boxes.
2. Interact with the boxes to summon the enemies and activate the traps.
3. Destroy the traps and clear out the enemies.

2. Trap Types:

1. Biological Battery: These devices power the summoned monsters. Destroy them quickly to weaken the enemies.
2. Chemical Poison: These traps spread poisonous clouds, making it harder to fight. Avoid stepping into the poison and kill the monsters to disable the traps.

3. Clearing the Areas:

1. Once you clear each trap, a signal will be sent. You will need to coordinate with your party to clear all four areas.
2. After all four areas are cleared, proceed to face the final boss, EL1-A17T.

Once all traps are cleared, you will face EL1-A17T:

1. The boss will use powerful area-of-effect attacks and summon additional enemies.
2. Focus on dodging the boss’s attacks while dealing consistent damage.
3. Make sure to clear any remaining traps in the boss area to avoid complications during the fight.

After defeating EL1-A17T:

1. Speak with Elena Volkova for the final dialogue.
2. Exit the instance using the Cave Out NPC or wait for Elena to guide you back.

1. Always stay close to your party members, especially when dealing with the traps and boxes.
2. Use AoE skills to quickly clear the summoned monsters and avoid getting overwhelmed by the traps.
3. Communicate with your party during the boss fight to coordinate your attacks and movement.

Good luck in your operation!