Fortress System Guide

Overview

Fortresses are strategic military installations that clans can capture and control in the world of Lineage 2. Unlike castles, fortresses are smaller but more frequent siege targets, offering valuable benefits to controlling clans. The Oasis Interlude+ server features a fully implemented fortress system with two main fortresses available for conquest.

Available Fortresses

Fortress Types

Territorial Fortresses (Blue Flags)

Built within territories to defend against monster attacks and provide regional control.

Border Fortresses (Red Flags)

Established along boundaries between territories, serving as strategic military outposts.

Requirements for Participation

Clan Requirements

• Minimum Clan Level: 4 or higher
• Siege Registration Level: 5 or higher
• Cannot own a castle while participating in fortress sieges
• Only one fortress siege registration allowed at a time
• Cannot register during castle sieges

Registration Process

1. Locate the Tactics Corps NPC near the fortress you wish to attack
2. Speak with the NPC and select "Register fortress siege warfare"
3. Registration closes 1 hour before the siege begins
4. Only clan leaders can register their clan for siege

Fortress Structure

Each fortress consists of:

Central Command Post

The main control center where the Flag of Combat must be placed to win the siege.

Five Types of Barracks

1. Defense Barracks - Basic defensive units
2. Archer Barracks - Ranged combat units
3. Support Barracks - Healing and support units
4. Officer's Barracks - Elite combat units
5. Control Center - Requires Warsmith or Maestro to operate machinery

Siege Mechanics

Pre-Siege Phase

• Registration period opens after the previous siege ends
• Guards and bosses spawn based on current ownership status
• All fortress doors close at siege start

Siege Phase

• Time Limit: 10 minutes to conquer all barracks
• Objective: Defeat the commander in each barracks
• Control Center: Must have a Warsmith or Maestro to operate machinery
• Command Gate: Opens after all barracks are conquered
• Victory Condition: Hang the Flag of Combat on the highest floor of the command post

Post-Siege Phase

• Winning clan gains control of the fortress
• New owner's guards and facilities spawn
• Registration opens for the next siege cycle

Fortress Benefits

Support Services

Clan members can use HP, MP, and EXP restoration services for a fee:

HP Restoration

MP Restoration

EXP Restoration

Item Creation Facilities

Fortress owners can lease item creation services:

Teleportation Services

Access to strategic locations throughout the world:

Level 1 Teleports (1,000 adena lease)

• Entrance to the Fortress of Resistance
• Tanor Silenos Barracks
• Cruma Marshlands
• Execution Grounds
• Town of Dion
• Floran Village

Level 2 Teleports (2,000 adena lease)

• All Level 1 destinations plus:
• Cruma Tower
• Death Pass
• Town of Gludio
• Town of Giran

Decorative Features

Clan Reputation Rewards

Reputation Points

Strategic Importance

Territorial Control

• Fortresses are linked to castles as domain/boundary fortresses
• Control affects regional influence and trade routes
• Provides strategic advantages for clan warfare

Economic Benefits

• Revenue from teleportation services
• Item creation facilities for clan members
• Support services for clan activities

Military Advantages

• Strategic positioning for clan wars
• Control over regional resources
• Influence over territory access

Tips for Success

Preparation

1. Coordinate with your clan - Fortress sieges require teamwork
2. Ensure you have a Warsmith or Maestro for control center operations
3. Plan your attack strategy - 10 minutes is a tight time limit
4. Bring adequate supplies - HP/MP potions and scrolls

During Siege

1. Focus on barracks commanders - They must be defeated to progress
2. Maintain communication - Coordinate attacks with clan members
3. Watch the time - 10-minute limit is strict
4. Protect your Warsmith/Maestro - They're essential for control center

Defense

1. Station guards strategically - Cover all barracks entrances
2. Maintain fortress facilities - Keep teleports and services active
3. Monitor registration periods - Know when attacks might come
4. Build alliances - Coordinate with friendly clans

Conclusion

The fortress system in Oasis Interlude+ provides an exciting and rewarding territorial control mechanism. Success requires strategic planning, coordinated teamwork, and combat prowess. Whether attacking or defending, fortresses offer significant benefits to controlling clans while adding depth to the server's PvP experience.Remember: Fortress control is temporary - the "3-day reign" is a constant reminder that power can change hands quickly in the world of Lineage 2!

Fortress vs Castle Siege Relationship

Separate Systems:

• Castle Sieges: Happen every 2 weeks on Sundays (different castles rotate)
• Fortress Sieges: Happen weekly (Tuesdays and Fridays)
• Different Requirements: You can't own a castle while participating in fortress sieges

Strategic Connection:

How They Work Together:

1. Territorial Control: Fortresses act as "domain" and "boundary" fortresses for castles
2. Strategic Positioning: Controlling fortresses gives advantages in castle sieges
3. Economic Benefits: Both provide revenue and clan benefits
4. Different Schedules: They don't conflict - fortresses are weekly, castles are bi-weekly

Key Differences:

So while fortresses are part of the overall siege warfare system, they operate as independent weekly events that complement but don't directly interfere with the main castle siege cycle. They're more like "mini-sieges" that provide additional territorial control opportunities between the major castle sieges.