MU Online Elemental Damage & Defence Guide (Season 18+)

In MU Online Season 18+, the Elemental System adds a full extra layer of damage and defence on top of your normal stats. By using pentagrams and errtels, you gain an elemental type (Fire, Water, Earth, Wind or Darkness) that interacts with your opponent’s element and can change damage by up to ±20%.

This guide explains how elemental damage and defence works, shows the elemental damage table, and gives you a clear example of a strong PvP pentagram build using Lemuria Orb and all 5 errtels.

1. What Is the Elemental System?

The elemental system is unlocked when you equip a pentagram. A pentagram:

• Gives you an element: Fire, Water, Earth, Wind or Darkness.
• Adds Elemental Attack (ELE ATK) and Elemental Defence (ELE DEF).
• Has 1–5 slots where you can equip errtels for extra bonuses.

In PvP, elemental damage gets a big bonus. When your pentagram is equipped and hits an enemy, your elemental damage is multiplied and then modified again based on element vs element (see the table below). :contentReference[oaicite:0]{index=0}

2. Elemental Damage & Defence Relationships

Elements affect each other’s damage and defence by up to 20%. That means your hit can be as low as 80% of normal damage (bad matchup) or as high as 120% (good matchup), depending on your element vs the enemy’s element.

Here is the official elemental relationship table (attacker on the left, defender on top):

Attacker \ Defender	Fire	Water	Earth	Wind	Darkness	None
Fire	100%	80%	90%	90%	120%	120%
Water	120%	100%	80%	80%	110%	120%
Earth	110%	120%	100%	100%	90%	120%
Wind	90%	110%	120%	100%	80%	120%
Darkness	80%	90%	110%	110%	100%	120%

If the defender has no pentagram equipped (None), the attacker always deals 120% elemental damage – this is why using a pentagram is basically mandatory in PvP at higher Seasons.

2.1. Elemental “Strengths” and “Weaknesses”

Based on the table, you can think of each element like this:

• Fire – Big damage vs Darkness and vs players with no pentagram; weak vs Water.
• Water – Big damage vs Fire; weaker vs Earth and Wind.
• Earth – Strong vs Fire and Water; weak vs Darkness.
• Wind – Strong vs Water and Earth; weak vs Darkness.
• Darkness – Strong vs Earth and Wind; weak vs Fire.

In practice, swapping to the “right” pentagram against your enemy can easily give you +20% extra damage or deny them that same advantage.

3. Pentagrams & Errtels – Basics

Every pentagram belongs to one of the five elements. When you equip it, your character also becomes that element. For example, if you equip a Fire pentagram, your attacks are Fire element in the elemental system.

3.1. Types of Errtels

Pentagrams can be equipped with up to five errtels. Errtels are special stones that add extra elemental attack, defence and utility:

• Errtel of Anger – focus on elemental attack & damage.
• Errtel of Blessing – focus on elemental defence.
• Errtel of Integrity – extra attack vs specific elements and success rate.
• Errtel of Divinity – extra defence vs specific elements.
• Errtel of Radiance – special skills & utility (Bastion, Punish, Immune, Berserk, etc.).

3.2. Mastery Pentagrams & Lemuria Orb

Later Seasons introduce Mastery pentagrams such as Lemuria’s Orb, Runedil’s Harp, Arca’s Prophecy, Antonia’s Sword, etc. These have higher elemental attack/defence and special set options when equipped with the right ranks of errtels.

For PvP, Lemuria Orb is often used because you can combine it with all 5 errtel types and build a very flexible setup to counter different enemy elements.

4. Strong PvP Pentagram Build Example (Lemuria Orb)

Below is an example of a Season 18+ PvP build for the elemental system using a Lemuria Orb and all 5 errtels. The idea is:

• Maximize PvP damage against your target element.
• Reduce damage taken from your weakness element.
• Use Radiance for strong defensive and offensive procs.

4.1. Errtel of Anger – Pure PvP Attack

• Set all options to PvP and level them up to at least +10.
• Choose “Attack against specific element” as one of the options (for example, vs Darkness, since Fire has advantage there).
• You can also select extra defence against an element to reduce the impact of your weakness. For Fire, that would usually mean extra defence vs Water.

Anger is your main offensive errtel, so always keep it focused on PvP damage and success rate.

4.2. Errtel of Blessing – Elemental Defence

• Again, set all options to PvP and level them up.
• Pick “Defence against specific element” and choose the element that counters yours (for Fire, usually Water), or the most common element used on your server.
• This greatly reduces the damage you take from that element and helps cover your natural weakness.

Blessing is your main defensive errtel – treat it like an elemental shield.

4.3. Errtel of Integrity – Extra Damage vs Target Element

• Integrity can give attack against “X” element and elemental attack success rate, making it perfect for focused PvP builds.
• Set the Rank 2 options to the element you want to kill faster. For a Fire build, choose extra damage vs Darkness (one of Fire’s best matchups).
• This pushes your maximum possible elemental damage vs that target element even higher.

Think of Integrity as a “sniper errtel” that amplifies your damage against the elements you pick.

4.4. Errtel of Divinity – Extra Elemental Defence

• Set all options to PvP defence.
• Like Blessing, Divinity can provide defence against specific elements. Use it to stack more defence vs your main weakness (e.g. Water for a Fire build) or against the most popular element in your server’s meta.
• Together, Blessing + Divinity can greatly reduce incoming elemental damage if you focus them on the same counter element.

4.5. Errtel of Radiance – Utility & Procs

Radiance is special: it gives powerful on‑hit or on‑receive effects like Bastion, Punish, Immune, Berserk, etc. A common PvP setup is:

• Rank 1: Defence (III) if you use a shield, or Attack (III) if you’re full glass‑cannon damage.
• Rank 2: Bastion – a strong defensive proc that massively mitigates incoming elemental damage when it activates.
• Rank 3: Punish – deals a big burst of elemental damage (around 30% extra) when triggered.
• Rank 4: Immune 2 – a temporary immunity / heavy reduction to elemental damage when activated.
• Rank 5: Berserk – a powerful damage buff at the cost of some defence (exact behaviour can vary by server).

Together, these Radiance options give you a mix of survival (Bastion, Immune 2) and kill pressure (Punish, Berserk) on top of your main Anger/Integrity damage.

5. Practical Tips for Elemental PvP

• Carry multiple pentagrams: If you can, keep at least two elements ready. Swapping element mid‑fight can turn a bad matchup (80%) into a good one (120%).
• Know the meta element: If most players on your server use Fire, stacking defence vs Fire in Blessing/Divinity is a huge value.
• Don’t forget None: Players without a pentagram take 120% elemental damage – abuse this in PvP arenas and events.
• Level your errtels: Rank and level matter a lot. A +10 errtel hits much harder and defends much better than a low‑level one.
• Rebuild when you swap element: If you change from Fire to Water, rebuild your Anger/Integrity targets and Blessing/Divinity defences to match the new strengths/weaknesses.

Conclusion

The elemental system in MU Online Season 18+ is not just a small bonus – it’s a full extra damage and defence layer that can swing fights by 20% or more. Understanding the element vs element table, using a good pentagram + errtel setup, and adjusting to the enemy’s element is critical if you want to dominate PvP.

Start with a solid pentagram like Lemuria Orb, follow the errtel ideas in this guide, and then tweak your elements and defences based on what you see in your server’s meta. With practice, you’ll feel your elemental damage doing real work in both PvP and PvE.