MU Online Pentagram & Elemental Guide

The pentagram is an extra "elemental layer" that newer MU Online servers (the more updated versions of the game) add on top of normal fighting. Put one on and your character gets an element, deals bonus elemental damage, and builds elemental defense. That defense quietly wins a lot of late-game PvP fights (player versus player, meaning fights against other people). This guide explains all of it in plain words and shows you how to start.

What the pentagram & elemental system is (and which servers have it)

The pentagram is an item that goes in its own gear slot. The second you put one on, your character gets an element plus two new stats: Elemental DMG (extra damage you deal) and Elemental DEF (protection from elemental damage). Think of it as a whole second fighting system sitting on top of the normal attack and defense stats you already use.

This only shows up in newer versions of the game. You will not find it on classic or old servers. If you are playing 0.97d, 0.99b, or anything in the Season 1-6 range (these are the early, old-school versions), the pentagram does not exist there, so this guide will not help. For those versions, check the 97d / 99b classic guide or the Season 6 guide instead.

The five elements and the strength / weakness wheel

There are five elements: Fire, Water, Earth, Wind, and Darkness. Your pentagram gives you exactly one of them. When you hit a target, the game checks your element against theirs, like a rock-paper-scissors wheel, and bumps your elemental damage up or down based on the matchup.

• A good matchup deals more elemental damage, usually up to about 120%.
• A bad matchup deals less, usually as low as about 80%.
• A neutral (even) matchup sits around 100%.

The most common example you will hear is Fire being strong against Darkness. Here is a simple attacker-versus-target view of how the steps work. ("Classic" here just means the default setup most servers start from.)

One heads-up: the exact percentages change a little between versions. Some sources show clean 80 / 100 / 120% steps, others add 90% and 110% in between, and Darkness in particular is shown different ways. The official numbers and the private-server files (the data each server runs on) do not always match. So use the table above as the general idea, not a fixed formula, and double-check on your own server.

Elemental DMG / DEF vs normal DMG / DEF

The main thing to get is this: elemental stats are separate from your normal stats. Your regular attack and your regular defense keep working just like before. Elemental DMG and Elemental DEF are counted on their own, and they only deal with other elemental stuff.

• Elemental DMG is extra damage added on top of your normal hits once a pentagram is on, then changed by the matchup wheel above.
• Elemental DEF cuts down the elemental damage coming at you. You build it from your pentagram plus the errtels slotted into it. (An errtel is a stone you put in the pentagram. More on those below.)
• In later updates, some stat points and item options also add to elemental ATK and DEF, so your character build can boost the elemental layer too.

Because this damage runs on its own track, two characters with the exact same normal gear can play very differently once elements come in. That is why the elemental layer matters so much in PvP, and why it gets a big bonus there.

Pentagram items, grades, and sockets

The pentagram is the slot item that holds everything: it gives you your element and has the sockets (the slots) where errtels go. Pentagrams come in grades, or rarities, usually Beginner, Normal, Rare, and Unique, plus a higher Mastery Pentagram tier. Better grades usually have higher base stats and need a higher level to wear.

• Sockets: pentagrams dropped by monsters usually have 2 to 4 sockets, and you can add more. The 5th socket is special and saved only for the Errtel of Radiance.
• Example items: names you might see include the Manuscript of Murren and the Scroll of Etramu, with options like the Lemuria Orb as a mastery-tier pentagram. These names and their stats change by season and by server, so do not treat any single number as set in stone.
• Mastery Pentagrams are a higher tier. They usually need a 3rd class change (a big upgrade your character earns later that unlocks a new, stronger class) and around level 800, and they use Mastery Errtels instead of the normal ones.

Errtels: the five types and what they do

An errtel is a special stone you slot into a pentagram socket to add elemental stats and effects. There are five errtel types, one for each job, and the main rule is simple: the errtel's element has to match the pentagram's element to fit. A Fire errtel only goes into a Fire pentagram.

The Errtel of Radiance is the standout. It sits in the special 5th socket and unlocks active skills you can use, not just flat stat boosts. "Errtel of Anger" (the community and MU Online Fanz name) and "Errtel of Fury" (the official Webzen name) are the same item, just translated differently, so do not be thrown off if your game labels it the other way. The other four names are the same across all versions.

Crafting and upgrading errtels at NPC Adniel

Almost everything elemental goes through one NPC: Adniel. (An NPC is a computer-controlled character in town that you talk to for services.) He is usually in Elveland (around 38, 215) and also in Acheron. He handles making errtels, leveling them, ranking them up, opening the Radiance slot, and Tier 4 elemental wing options. Here is the usual path.

A few extra notes. Elemental Runes are sold at potion shops in the main towns, so leveling errtels mostly costs Zen (the in-game gold money you earn from monsters) and time, not rare drops. Ranking is the pricey part because it eats up spare errtels of +7 or higher. And if you break down errtels you do not want, you usually get Elemental Powder, which you can combine (around 50 powder) into an Elemental Capsule. That last bit comes from just one source, so double-check it on your server.

Practical tips: choosing an element and building errtels

You do not need a perfect, fully optimized build on day one. Just put on any pentagram so you stop taking full elemental damage, then grow from there. When you are ready to focus your build, match it to how you actually play.

Plan your materials before you dive in. You will slowly burn through Mithril Fragments, Jewels of Bless, and Elemental Runes, and ranking errtels eats up spares you have to make twice. Treat the elemental layer as a long-term goal you chip away at while you also work on your wings, excellent items, and ancient sets, not something you finish in one play session. To see where this fits in your overall progress, check the leveling guide and the stat builds guide.

Last thing: the elemental layer only matters if your server has it. If you are still picking where to play and want newer systems like this, start with the best MU Online private servers 2026 guide, then browse the live MU Online ranking for active high-season servers.