Pentagram: Pieces, Combinations and Detailed Benefits in MU Online

The Pentagram is the elemental customization system in MU Online from Season 12 onward. Unlike the Excellent or Ancient systems — which add fixed bonuses to equipment — the Pentagram introduces a layer of 5 interactive elements that combine to create unique build effects. This guide details each piece, the combinations between them and the real numeric benefits of each configuration.

What the Pentagram is — the item's structure

The Pentagram is a special item that occupies its own slot in the character interface — completely separate from armor, weapon, wings, ring and pendant. Visually it's represented by a five-pointed star, each point corresponding to an element.

Pentagram structure:

Available slots (1 per element):
→ Fire slot      — takes a Fire Errtel
→ Water slot     — takes a Water Errtel
→ Earth slot     — takes an Earth Errtel
→ Wind slot      — takes a Wind Errtel
→ Darkness slot  — takes a Darkness Errtel

Unlocked-slot progression:
→ Pentagram level 1: 1 active slot
→ Pentagram level 2: 2 active slots
→ Pentagram level 3: 3 active slots
→ Pentagram level 4: 4 active slots
→ Pentagram level 5: all 5 slots active

Refining the Pentagram:
→ Uses Jewel of Bless and Jewel of Soul as base-level items
→ The higher the Pentagram's level: the more slots unlocked
→ Maximum Pentagram level: varies by version (usually level 5 = complete)

The Errtels — the Pentagram's pieces

The Errtels are the elemental stones socketed into the Pentagram. Each Errtel has three defining attributes: element, type and level.

Errtel types

Errtel levels and numeric impact

The 5 elements in detail

Fire — direct damage and burst

Fire element — characteristics:

Fire Attack Errtels:
→ Level 1-5:  +3% to +8% fire damage (Nova, Chain Lightning, Rageful Blow)
→ Level 6-10: +10% to +18% fire damage
→ Level 11-15: +20% to +50% fire damage
→ Additional effect (level 10+): chance to apply "Burn" — a 3s DoT

Fire Defense Errtels:
→ Reduces damage taken from fire attacks
→ Level 15: -40% fire damage taken
→ Relevant in raids where the boss uses fire abilities

Fire Utility Errtels:
→ Burn propagation (DoT splash to adjacent monsters)
→ Level 10+: burn lasts 5s and reduces the target's defense by 5%

Classes that maximize Fire:
→ Dark Wizard: Nova and Chain Lightning gain the full bonus
→ Magic Gladiator: fire Fire Slash and Power Slash benefit
→ Dark Knight: Rageful Blow amplified in S12+ versions

Water — control and sustain

Water element — characteristics:

Water Attack Errtels:
→ Level 1-5:  +2% to +6% water damage + 5% chance of a 1s slow
→ Level 6-10: +8% to +15% water damage + 10% chance of a 2s slow
→ Level 11-15: +16% to +30% water damage + 20% chance of a 3s slow
→ Slow reduces the target's movement and attack speed by 30%

Water Defense Errtels:
→ Increases max HP and resistance to slow/freeze
→ Level 15: +8% max HP + immunity to slow for 3s after being hit

Water Utility Errtels:
→ Area slow in a 2-3 cell radius around the character
→ Level 10+: area slow lasts 2s and has a 10s cooldown

Classes that maximize Water:
→ Fairy Elf: Ice Arrow amplified, longer slow
→ Summoner: Decay and Weakness boosted
→ Raid supports: a Water Defense Errtel raises the group's HP (passive)

Earth — defense and immobilization

Earth element — characteristics:

Earth Attack Errtels:
→ Level 1-5:  +2% to +5% earth damage + 3% chance of a 0.5s root
→ Level 6-10: +7% to +13% earth damage + 8% chance of a 1s root
→ Level 11-15: +14% to +25% earth damage + 15% chance of a 2s root
→ Root: the target can't move, but can still attack

Earth Defense Errtels:
→ Increases base Defense and max HP
→ Level 15: +12% base Defense + +10% max HP simultaneously

Earth Utility Errtels:
→ Knockback resistance + a chance to reflect knockback onto the attacker
→ Level 10+: reflected knockback has a 20% chance + stuns for 0.5s

Classes that maximize Earth:
→ Dark Knight: the definitive raid tank build
→ Dark Lord: Castle Siege and group tank
→ Magic Gladiator: PvP survivability with a DL build

Wind — speed and evasion

Wind element — characteristics:

Wind Attack Errtels:
→ Level 1-5:  +3% to +7% attack speed + +2% effective AGI
→ Level 6-10: +9% to +16% attack speed + +5% effective AGI
→ Level 11-15: +18% to +30% attack speed + +8% effective AGI
→ Effective AGI: improves critical rate and evasion proportionally

Wind Defense Errtels:
→ Increases evasion rate (chance to dodge physical attacks)
→ Level 15: +15% base evasion — very relevant in high-speed PvP

Wind Utility Errtels:
→ Temporary speed burst: +50% movement speed for 2s
→ Cooldown: 15s. Trigger: on taking damage above 10% of max HP

Classes that maximize Wind:
→ Fairy Elf AGI: firing speed of Multi-Shot and Triple Shot
→ Magic Gladiator: combat mobility and a faster Twisting Slash
→ Dark Knight AGI: Twisting Slash and Dance of Death at high cadence

Darkness — debuff and lifesteal

Darkness element — characteristics:

Darkness Attack Errtels:
→ Level 1-5:  +1% to +3% lifesteal + -3% target defense for 3s
→ Level 6-10: +4% to +8% lifesteal + -6% target defense for 4s
→ Level 11-15: +9% to +15% lifesteal + -10% target defense for 5s
→ Lifesteal: heals HP based on damage dealt (doesn't affect boss HP)

Darkness Defense Errtels:
→ Resistance to debuffs (Poison, Weakness, Decay, Stun)
→ Level 15: immunity to debuffs for 2s every 20s (passive)

Darkness Utility Errtels:
→ Drains the target's MP + applies Weakness (reduces the target's ATK by 20%)
→ Level 10+: Weakness lasts 6s and reduces the target's elemental resistance by 10%

Classes that maximize Darkness:
→ Summoner: debuff cycle massively amplified
→ Dark Lord: field control in Castle Siege and group PvP
→ Dark Wizard PvP: burst + debuff → a faster kill cycle

Combination table by objective

Detailed combinations by class (S12)

Dark Wizard — Grand Master (ENE build):

PvM Farm:
→ Slot 1: Fire Attack Errtel level 11+ (core of Nova damage)
→ Slot 2: Fire Attack Errtel level 8+ (secondary amplification)
→ Slot 3: Fire Utility Errtel level 6+ (burn splash)
→ Slot 4: Wind Attack Errtel level 6+ (cast speed)
→ Slot 5: Water Defense Errtel level 4+ (minimal survivability)

PvP:
→ Slot 1: Fire Attack Errtel level 11+ (burst)
→ Slot 2: Darkness Utility Errtel level 8+ (Weakness on the target)
→ Slot 3: Darkness Attack Errtel level 8+ (lifesteal + -DEF target)
→ Slot 4: Water Utility Errtel level 6+ (slow after burst)
→ Slot 5: Wind Attack Errtel level 6+ (cast speed)

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Dark Knight — Blade Master (STR build):

Raid Tank:
→ Slot 1: Earth Defense Errtel level 11+ (+DEF +HP)
→ Slot 2: Earth Defense Errtel level 11+ (second tank slot)
→ Slot 3: Water Defense Errtel level 8+ (+HP +slow resist)
→ Slot 4: Earth Utility Errtel level 6+ (knockback resist)
→ Slot 5: Fire Attack Errtel level 6+ (minimal damage for threat)

Physical DPS:
→ Slot 1: Fire Attack Errtel level 11+ (Rageful Blow)
→ Slot 2: Wind Attack Errtel level 10+ (ATK speed)
→ Slot 3: Fire Attack Errtel level 8+ (Twisting Slash)
→ Slot 4: Earth Defense Errtel level 6+ (survivability)
→ Slot 5: Darkness Attack Errtel level 6+ (lifesteal)

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Fairy Elf — High Elf (AGI + ENE build):

Group Support:
→ Slot 1: Water Utility Errtel level 10+ (area slow for control)
→ Slot 2: Wind Utility Errtel level 8+ (buff speed)
→ Slot 3: Water Defense Errtel level 8+ (HP for survivability)
→ Slot 4: Earth Defense Errtel level 6+ (extra defense)
→ Slot 5: Wind Attack Errtel level 6+ (firing speed)

DPS Archer:
→ Slot 1: Wind Attack Errtel level 11+ (critical attack speed)
→ Slot 2: Fire Attack Errtel level 10+ (Triple Arrow damage)
→ Slot 3: Wind Attack Errtel level 8+ (effective AGI)
→ Slot 4: Darkness Attack Errtel level 6+ (lifesteal)
→ Slot 5: Water Defense Errtel level 4+ (survivability)

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Summoner — Dimension Master (ENE + debuff):

PvP and Control:
→ Slot 1: Darkness Attack Errtel level 11+ (lifesteal + -DEF)
→ Slot 2: Darkness Utility Errtel level 10+ (amplified Weakness)
→ Slot 3: Darkness Attack Errtel level 8+ (double debuff stack)
→ Slot 4: Water Utility Errtel level 8+ (complementary slow)
→ Slot 5: Fire Attack Errtel level 6+ (Drain Life burst)

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Magic Gladiator — Duel Master (STR+ENE hybrid):

Hybrid PvP/PvM:
→ Slot 1: Fire Attack Errtel level 11+ (Fire Slash damage)
→ Slot 2: Wind Attack Errtel level 10+ (attack speed)
→ Slot 3: Fire Attack Errtel level 8+ (amplified Power Slash)
→ Slot 4: Darkness Attack Errtel level 6+ (lifesteal sustain)
→ Slot 5: Earth Defense Errtel level 6+ (defense for survivability)

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Dark Lord — Lord Emperor (CMD + STR):

Castle Siege Control:
→ Slot 1: Darkness Utility Errtel level 11+ (area Weakness)
→ Slot 2: Earth Attack Errtel level 10+ (group root)
→ Slot 3: Darkness Attack Errtel level 8+ (-DEF for allies to exploit)
→ Slot 4: Earth Defense Errtel level 8+ (frontline tank)
→ Slot 5: Water Defense Errtel level 6+ (extra HP)

Where to obtain each Errtel type

Synergy between the Pentagram and S12 sets

In Season 12+, sets like Bloodangel, Darkangel and Holyangel have a declared elemental affinity. When the set's element matches the main element of the Errtels equipped in the Pentagram, an active synergy occurs:

How elemental synergy works:

Example — DW with a Fire Holyangel set:
→ Fire Holyangel: +18% base fire damage (set bonus)
→ + Fire Attack Errtel level 12: +24% base fire damage
→ With active synergy: the combined bonuses receive an additional +15%
→ Effective total: (18% + 24%) × 1.15 = +48.3% fire damage

Without synergy (Darkangel set + Fire Errtels):
→ Darkangel: general attack bonus +15% (no fire affinity)
→ + Fire Attack Errtel level 12: +24% fire damage
→ Total: 15% general ATK + 24% fire = no synergy multiplier

Difference: synergy delivers ~15-20% additional efficiency

Frequently asked questions about combinations

Can I use two Errtels of the same element in the Pentagram? Yes. Two Fire Attack Errtels in different slots stack — there's no limit on repeated elements. The only restriction is that each slot only accepts an Errtel of the element corresponding to that slot (the Fire slot only takes a Fire Errtel).

Is a Utility Errtel worth it against an Attack Errtel? It depends on the context. In pure PvM, two Attack Errtels of the same element always beat one Attack + one Utility in terms of DPS. In PvP, Utility Errtels that apply slow or Weakness frequently decide fights — the reduced damage is offset by the control gained.

Which element is the most versatile? Fire for pure DPS, Darkness for PvP, Earth for tanking. If you don't know which to pick, Fire is the most universally valid for most damage characters.

See also: Element System and Pentagram (an overview of the elemental system), Errtels and Pentagram (a guide to obtaining and upgrading them), and Bloodangel, Darkangel and Holyangel Sets (the elemental synergy of S12+ sets).

Frequently asked questions