Following affects all types of items where quality can be altered.
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You can also see it in ›SPREADSHEET‹ or ›TABLE‹
Example: 90 lvl weapon with following stats:
[LIST]
[*]Weapon essence: 7080 ATK, 6814 MATK, 4 ATKSPD
[*]Keen Legendary Shard: 30 BAL, 31 CRIT
[*]Solid Legendary Shard: 45 BAL, 44 STR, 24 AGI, 51 INT, 32 WIL
[*]Lightweight Legendary Shard: 21 CRIT, 5 ATKSPD
[*]Perfect Legendary Shard: 4720 ATK, 4605 MATK, 66 STR, 36 AGI, 74 INT, 48 WIL
[/LIST]
TOTAL: 11800 ATK, 11419 MATK, 75 BAL, 52 CRIT, 9 ATKSPD, 110 STR, 60 AGI, 125 INT, 80 WIL
Since only ATK, MATK, DEF, STR, AGI, INT and WIL are affected by quality - rest stats will be ignored from this point on.
Sticking to the table and item's level, the example item would have following stats:
[LIST]
[*]1★: 11328 ATK, 10962 MATK, 884 STR, 81 AGI, 100 INT, 64 WIL (ATK and MATK are lower by 4%, STR/AGI/INT/WIL by 20%)
[*]2★: 11800 ATK, 11419 MATK, 110 STR, 60 AGI, 125 INT, 80 WIL (unchanged)
[*]3★: 12036 ATK, 11647 MATK, 126 STR, 69 AGI, 143 INT, 92 WIL (ATK and MATK are higher by 2%, STR/AGI/INT/WIL by 15%)
[*]4★: 12272 ATK, 11876 MATK, 132 STR, 72 AGI, 150 INT, 96 WIL (ATK and MATK are higher by 4%, STR/AGI/INT/WIL by 20%)
[*]5★: 12508 ATK, 12104 MATK, 137 STR, 75 AGI, 156 INT, 100 WIL (ATK and MATK are higher by 6%, STR/AGI/INT/WIL by 25%)
[/LIST]
[LIST]
[*]Quality Booster Coupon (+# Star)
Cannot use after it expires.A coupon that improves the quality of an item by # Stars.
This limited item can only be used on items 4 Stars and lower. Can't be used on an item if its stats are fixed.
Right-click to use.
Once you start using it, its 30-days expire limit will be applied. Cannot use after it expires.
Functionality: Increases quality of selected item by #, up to 5.
Expiration: Affects only unused coupon - applied to item is permanent.
Obtainability: Exchange Store: Daily Mission Ticket, Events.
Tradability: None.
[*]Raonne's 2-Star Quality Coupon (7 Days)
Functionality: Increases quality of selected item from 1 to 2.A coupon that upgrades a 1-Star item to 2-Star. Only works on 1-Star items.
Right-click to use.
*Cannot be used on time-restricted items or items without quality.
*Cannot be used after expiration.
Expiration: Unknown.
Obtainability: Exchange Store: Daily Mission Ticket.
Tradability: None.
[*]Lubber's Sketchy Quality Coupon
Functionality: Can increase quality of selected item, but cannot decrease it.A coupon that can randomly change the quality of an item up to # Stars.
This limited item can only be used on items 4 Stars and lower. Can't be used on an item if its stats are fixed.
Right-click to use.
Cannot use after it expires.
Expiration: Varies, usually 30-90 days in coupon form.
Obtainability: Events.
Tradability: None.
[*]Lubber's Risky Quality Coupon
Functionality: Unknown.A coupon that randomly changes an item's quality from 1 to #.
Right-click to use.
The item will then be available for only 12 hours.
The item will be bound to your character if its quality improves to 5 Stars with this coupon.
Expiration: Unknown.
Obtainability: Unknown. Was it even ever available?
Tradability: Unknown.
[/LIST]

Comments
ALL EVERTYHING ABOUT QUALITY IN VINDICTUS
GEAR PROGRESSION
QUALITY DATA DETAILS INFORMATION PROCESS
QUALITY STATS TABLE SPREADSHEET EXCEL
FOR WEAPON ARMOR ARMOUR SHIELD ACCESSORY
QUALITY STARS ★ * FUNCTIONALITY HOW DOES IT THEY WORK
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