Underground Prison

Overview

Underground Prison is an instance-tier dungeon set in an underground prison facility — featuring criminal-mob encounters, prison-warden boss fights, and cell-block exploration. Mid-tier endgame difficulty with reasonable progression rewards.

This article covers zone layout, key NPCs, quest hooks, and rewards.

Name	Underground Prison
Type	Equipment Expedition
Required Level	70+
Reward	Level 60 blue equipment, achievements, resources.

The Underground Prison is part of Challenge Expedition II. You can enter it with a certain probability by applying for the "Random Challenge Expedition II" in the party window, accessed via the hotkey "T" or the

button in the main menu. Successfully completing the expedition this way grants additional rewards.

You can also enter the Underground Prison through NPC Warden Robert, located in Hossinger between the Tavern and the Trade Union (requires a group of 2 or more players). However, completing the expedition this way does not grant additional rewards. The advantage of entering through the NPC is that it does not consume patience points, unlike the Random Challenge Expedition.

Description

The Underground Prison expedition involves defeating 5 bosses, each providing level 60 blue equipment upon victory. Additionally, the first successful completion of the day guarantees 20 God of War points.

Enemies in this expedition are not particularly strong but inflict various negative effects and some become temporarily invulnerable.

Strategy

If your level is 60+ and your gear is lacking, consider the following recommendations:

• Include a healer in the party: Priest, Bard, Vampire.
• Include a tank: Protector, Warrior, Reaper (HP not less than 30,000).
• Include ranged and AoE damage dealers: Mage, Shooter, Assassin.
• Repair equipment and stock up on HP and MP potions before the expedition.
• Always defeat mobs before approaching bosses.

Following these tips will significantly increase your chances of success.

Map legend:

• Green dots: Entrance and exit
• Black line: Path
• Red dots: Bosses
• Orange dots: Stop points for mob kills and boss preparation

Start in the anteroom with a mnemonic stone and one exit to the Prison corridors. Wait for all party members, buff up, and drink enhancing elixirs. When ready, proceed.

The tank leads, followed by the rest. Gather mobs along the way and defeat them in the room before the first boss.

Bosses

First Boss: Cook Jess

• Features: AoE attacks, periodic shooting at any party member.
• Tactics: Ranged and AoE attackers should position themselves to avoid pulling mobs from the next corridor. Melee and tank stay close to the boss. Apply shields to low HP members. No special actions needed when the boss enhances evasion.

Second Boss: Patrick Ironweave

• Features: AoE attacks, coma, slowness, paralysis, cages a random player.
• Tactics: Tank moves the boss to the back of the room, turning it away from the party. Handle summoned mobs quickly, and heal players affected by "Dissolution".

Third Boss: Horned Monster

• Features: AoE attacks, weak and strong acid effects.
• Tactics: Stand under the boss to apply "Weak Acid" and avoid "Strong Acid". Avoid attacking during "Toxic Protection" if HP is low.

Fourth Boss: Leifris

• Features: Mass stun, monster summons, AoE attacks.
• Tactics: Tank turns the boss away from the party. Handle summoned mobs with AoE attacks.

Fifth Boss: God of Murder Cruel

• Features: Powerful AoE attacks, debuffs.
• Tactics: Tank keeps the boss at the far wall. Avoid AoE attacks when warned. Replace the tank if they fall.

Achievements

• Prison Expert: Complete the expedition in 20 minutes or less.

Resources

The Underground Prison provides resources for crafting special level 5 crystals.

• Icy Blood: Found in the corridor after the first boss. Requires Herbalist level 7.
• Scarlet Crystal and Stone: From Blood Sunset ore after the final boss. Requires Miner level 5.

Quests

Two story quests are associated with the Underground Prison, offering significant experience.

Innocence of Toer

Level 70+ required. Aunt Kerry asks you to investigate Toer's fate. Find his body near the second boss and the verdict in Leifris's room.

Loyal Friend Pondo

Level 70+ required. Drunkard Pondo asks you to find his guard dog. Eliminate "Guard Dog" mobs until the quest completes.

FAQ

Q: Recommended level? A: Level 75+.

Q: What's here? A: Underground prison dungeon with prison-warden boss fights, cell-block stealth segments.

Q: Best drops or rewards? A: Prison-themed gear sets, rare consumables, Activity Points.

See Also

• Daily Quests
• Main site: Class guides