OSRS Toppling the Diarchy Guide for Elite Combat Achievement

In Old School RuneScape (OSRS), the “Toppling the Diarchy” is an elite combat achievement that challenges players to kill Dagannoth Rex and one other Dagannoth King (either Dagannoth Prime or Dagannoth Supreme) at the exact same time. This task, set in the Waterbirth Island Dungeon, requires precision, strategy, and a bit of luck. Whether you’re a seasoned player or an Ironman tackling this solo, this guide will walk you through the best methods, gear setups, and tips to conquer this achievement. Let’s dive into the details to help you add this prestigious task to your combat achievement log!

The Dagannoth Kings (DKs) are a trio of level 303 bosses—Dagannoth Rex (melee), Dagannoth Prime (magic), and Dagannoth Supreme (ranged)—each representing a corner of the combat triangle. The “Toppling the Diarchy” task demands that you deal the killing blow to Rex and either Prime or Supreme simultaneously. This is no easy feat, as the kings regenerate health quickly, and their overlapping attacks in the multi-combat area can be overwhelming. Timing is critical, and the right approach can make or break your attempt.

Why This Achievement Matters

Completing “Toppling the Diarchy” grants progress toward the elite tier of Combat Achievements, unlocking rewards like a 5% increased chance for elite clue scrolls and Ghommal’s Hilt 4. For Ironmen, it’s also a step toward valuable drops like the Berserker Ring or Dragon Axe. The achievement’s difficulty makes it a badge of honor in the OSRS community.

Preparation for the Fight

Before heading to Waterbirth Island, ensure you’re well-prepared with the right gear, inventory, and knowledge of the arena. The Dagannoth Kings’ lair is deep within the dungeon, so plan for a challenging journey.

Recommended Stats and Requirements

• Attack and Strength: 75+ for melee accuracy and damage.
• Ranged: 80+ for effective attacks against Dagannoth Prime.
• Magic: 75+ for spells like Entangle or Ice Barrage.
• Defence: 70+ to tank hits in the multi-combat area.
• Prayer: 50+ for protection prayers (Piety recommended).
• Quests: Complete Lunar Diplomacy for access to the dungeon.

Gear Setup

Your gear should balance offensive power with defensive capabilities, tailored to counter the combat triangle. Below is a recommended setup:

Slot	Item	Alternative
Head	Neitiznot Faceguard	Helm of Neitiznot
Cape	Fire Cape	Skill Cape
Body	Bandos Chestplate	Fighter Torso
Legs	Bandos Tassets	Obsidian Platelegs
Weapon	Voidwaker (for special attack)	Dragon Crossbow
Shield	Dragonfire Shield	Anti-Dragon Shield
Ammo	Ruby Bolts (e)	Diamond Bolts (e)

Inventory Setup

• Food: 10-15 high-healing items (Sharks or Monkfish).
• Potions: Super Combat Potion, Ranging Potion, Prayer Potions.
• Special Attack Weapon: Voidwaker or Dragon Crossbow.
• Magic Supplies: Runes for Entangle or Ice Barrage.
• Teleport: House Teleport or Rellekka Teleport.
• Optional: Black Chinchompas for AoE damage (solo method).

Strategies for Toppling the Diarchy

There are two primary approaches to this achievement: duo and solo. The duo method is easier due to coordinated attacks, while the solo method is ideal for Ironmen or those seeking a challenge.

Duo Method

Teaming up with another player simplifies the timing aspect. Here’s how to execute it:

1. Both players enter the Dagannoth Kings’ lair and target different kings (e.g., one attacks Rex, the other Prime).
2. Reduce both kings’ health to 8-12 HP, using Entangle on Rex to prevent him from regenerating too quickly.
3. Coordinate to use the Voidwaker special attack on the same game tick. The Voidwaker’s special guarantees at least 50% of your max hit, ensuring consistent damage.
4. Confirm both kings die simultaneously by checking the XP drop or kill feed.

Tip: Communicate via Discord or in-game chat to sync your attacks perfectly. Practice on a few kills to get the timing down.

Solo Method

For solo players, the task is trickier but achievable with precise positioning and special attacks. Follow these steps:

1. Start by luring Dagannoth Rex and Dagannoth Prime (or Supreme) to stack on top of each other in the lair.
2. Lower both kings’ health to 10-15 HP. Use Entangle or Ice Barrage to keep Rex immobile and prevent health regeneration.
3. Equip a Dragon Crossbow and use its special attack (dealing up to 30% extra damage) to hit both kings simultaneously. Alternatively, throw Black Chinchompas at Prime for AoE damage, though this is less reliable.
4. Watch for the XP drop indicating Rex’s death, then quickly finish the second king if the timing is slightly off.

Tip: Bring both a Dragon Crossbow and Black Chinchompas to increase your chances. The cross彼此

Tips and Tricks for Success

Here are additional pointers to boost your chances of completing “Toppling the Diarchy” efficiently:

Managing the Arena

The Dagannoth Kings’ lair is a multi-combat area, so expect attacks from multiple kings and their minions. Use Protect from Ranged to mitigate Supreme’s attacks and Protect from Magic for Prime. Lure Rex to a corner to minimize Supreme’s line-of-sight attacks.

Timing the Killing Blow

Game ticks in OSRS occur every 0.6 seconds, so precision is key. For the duo method, count down verbally or use a metronome to sync special attacks. For solo, practice the Dragon Crossbow special attack’s animation to gauge its travel time.

Dealing with Health Regeneration

The kings regenerate 9 HP every 6 seconds, so keep their health low and act quickly once they’re in position. Entangle (15-second bind) or Ice Barrage (20-second bind) are essential for controlling Rex.

Common Mistakes to Avoid

Steer clear of these pitfalls to save time and resources:

• Over-damaging one king: Accidentally killing one king too early disrupts the simultaneous kill. Monitor health closely.
• Poor positioning: Failing to stack the kings for AoE attacks reduces the solo method’s effectiveness.
• Running out of supplies: The dungeon trek is long, so bring extra food and potions to avoid mid-fight shortages.
• Ignoring prayer management: Constant prayer switching drains points fast. Sip Prayer Potions regularly.

With practice and patience, “Toppling the Diarchy” is an achievable goal that showcases your skill in OSRS. Equip your gear, rally a friend or go solo, and take down the Dagannoth Kings with precision. Good luck, and may the RNG gods be on your side!