Jewel of Bless: complete guide to the safe upgrade jewel in MU Online

The Jewel of Bless is simultaneously one of MU Online's most mechanical items (upgrades gear safely) and one of its most economic items (serves as the de-facto currency of most private servers). Understanding JoB means understanding both your gear progression and the server's economy.

What Jewel of Bless does

Mechanical function:

How it works:
1. Right-click Jewel of Bless in inventory (or drag onto item)
2. Click the item to upgrade
3. Item immediately gains +1 upgrade level
4. No animation, no failure chance, no risk
5. Item is safely at the new level

Safe upgrade range:
→ +0 → +1: safe (JoB)
→ +1 → +2: safe (JoB)
→ +2 → +3: safe (JoB)
→ +3 → +4: safe (JoB)
→ +4 → +5: safe (JoB)
→ +5 → +6: safe (JoB)
→ STOP HERE with JoB

Beyond +6:
→ +6 → +7: requires Jewel of Soul (has failure risk)
→ +7 → +8: requires Jewel of Soul (failure risk increases)
→ +8 → +9: requires Jewel of Soul (highest failure risk)

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The significance of "no failure":

Why safe upgrading matters:
→ All JoB upgrades are guaranteed — 0% chance to lose the item
→ No need to hedge or make backup plans
→ You CAN use JoB on your best item with no stress

Contrast with JoS:
→ Jewel of Soul can FAIL
→ On failure: item drops levels, or is destroyed (server-dependent)
→ Using JoS on a +9 item costs 1 JoS but risks downgrading to +8 or lower
→ This is why +7/+8/+9 items are more expensive than +6

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How many JoB per upgrade:

Simple math:
→ +0 to +6 = 6 Jewels of Bless
→ Full armor set (+0 to +6): 5 pieces × 6 JoB = 30 JoB for full set
→ Weapon (+0 to +6) = 6 JoB
→ Total for complete set + weapon at +6: ~36 JoB minimum

Why JoB is the economy's currency

What makes a good trade currency:

Requirements for something to work as informal currency:
1. Universally wanted (everyone needs it)
2. Predictable value (everyone knows what 1 unit is worth)
3. Divisible (can express large and small values)
4. Compact (doesn't take up too much inventory)
5. Not perishable (doesn't expire or break)

JoB satisfies all 5:
1. Universal: every player at every level needs JoB to upgrade gear
2. Predictable: 1 JoB = exactly +1 safe level, always
3. Divisible: 1 JoB = cheap; 500 JoB = expensive (full range expressed)
4. Compact: stacks high in inventory
5. Permanent: JoB doesn't expire

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Price examples (typical S6 mid-rate server):

Item                          | Price in JoB
------------------------------|---------------
Excellent item (1-2 options)  | 1-3 JoB
Excellent item (3 options)    | 3-10 JoB
Ancient item (single piece)   | 5-20 JoB
Wing L1                       | 10-30 JoB
Wing L2                       | 30-80 JoB
Wing L3 (fresh +0)            | 150-300 JoB
Wing L3 (+9 with options)     | 300-600 JoB
Fenrir Blue                   | 50-150 JoB
Fenrir Red                    | 100-250 JoB
Fenrir Black                  | 300-800 JoB
Jewel of Creation (each)      | 30-100 JoB
Loch's Feather (each)         | 50-200 JoB
Excellent set full (3 opts)   | 80-200 JoB total

Note: prices vary significantly by server rates, economy maturity, and demand.

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The JoB reference point in conversations:

When players say "how much is X?" the answer is almost always in JoB:
→ "That exc staff is 15 JoB"
→ "Wing L3 HC1 is going for 350 JoB right now"
→ "I'm selling my Fenrir Black for 500 JoB"

On some servers: JoB and wcoins (web-shop currency) coexist
→ But JoB remains the primary in-game trade unit
→ Even when wcoins exist: JoB is the "labor value" currency of in-game achievement

Where to farm JoB

Drop sources:

All monsters drop JoB, but rate varies significantly:

Low-level maps (Lorencia, Noria, Devias):
→ JoB drop: very rare, very low value per hour
→ Not an efficient JoB farming spot

Dungeon, Lost Tower:
→ JoB drop rate increases
→ Moderate efficiency for level 80-150 characters

Atlans, Tarkan:
→ Good JoB drop rate for level 130-250 characters
→ Butcher, Tantalos, Alquamos: better drops
→ Recommended: T2-T3 farming spots here

Aida:
→ Dark Elves and monsters: decent JoB rate
→ Level 200-280 efficient farming

Kanturu 1, 2:
→ Better JoB rate — mid-game
→ Level 280-360 farming

Raklion:
→ Best JoB rate per hour in S6
→ Requires strong gear (Level 350+ recommended)
→ End-game characters farm here for JoB income

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Event sources:

Blood Castle:
→ Completion rewards include JoB (amount scales with BC level)
→ BC5-BC7: meaningful JoB reward per run

Devil Square:
→ Completion rewards include JoB
→ DS4-DS7: strong JoB income for organized runs

Golden Invasion:
→ Golden monsters drop Boxes of Kundun
→ Boxes of Kundun contain: JoB, JoS, JoL, sometimes Excellent items
→ Top efficiency: kill as many Golden monsters as possible per invasion

Chaos Castle:
→ Top finishers receive JoB rewards
→ CC5-CC7: significant JoB prizes

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JoB income by server rate (approximate per hour at Raklion):

x1 server: ~5-15 JoB per hour
x10 server: ~50-150 JoB per hour
x100 server: ~200-500 JoB per hour (many from event rewards too)
x300 server: ~500-1000+ JoB per hour (events provide most)

High-rate servers: JoB is more abundant → prices in JoB are higher (300 JoB vs 50 JoB for same item)
Low-rate servers: JoB is scarce → even 5 JoB feels valuable

JoB in crafting and combinations

JoB in Wing crafting:

Wing L2:
→ Wing L1 + 1x Loch's Feather + 1x JoChaos + Zen
→ JoB not directly used IN the recipe
→ BUT: Loch's Feather costs ~50-200 JoB on market
→ So Wing L2 "costs" ~80-250 JoB when counting market prices

Wing L3:
→ Wing L2 + 3x Loch's Feather + 1x JoCreation + Zen
→ JoB not directly in recipe
→ BUT: materials cost 200-700 JoB total on market
→ Wing L3 = the most JoB-intensive pursuit in S6

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JoB in Fenrir crafting:

Stage 1 (Broken Horn): 20-30 JoB in direct material
Stage 2 (Fenrir Blue): 30-50 JoB in direct material + Claw of Beast
Stages 3-4: additional JoB investment

Total: 100-300 JoB directly in Fenrir crafting materials
→ Plus market cost of Claw of Beast (~50-150 JoB)

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Using JoB to upgrade items BEFORE selling:

Common strategy:
→ Find excellent item at +0 or +3
→ Upgrade to +6 with JoB before selling
→ +6 item sells for more than +0 + 6 JoB (price premium for convenience)

When this strategy works:
→ On active markets where +6 items are preferred
→ When demand for high-level items exceeds demand for raw JoB
→ On mid-to-high rate servers (low-rate servers: raw JoB is preferred)

When NOT to upgrade before selling:
→ On very low-rate servers: buyers prefer raw JoB over upgraded items
→ When the item might be a combination ingredient (ingredients may need low levels)

See also the Jewel of Soul guide (the +7/+8/+9 upgrade path with failure risks), the Jewels system overview (all jewels in one place), and the MU economy guide (how JoB prices and server rates interact).

Frequently asked questions