Upgrading Items in KO is the biggest mystery of the game and one of the funnest trying to unlock the dreaded Magic Anvil so here is a quick guide on my own experiences of percentages on items and way of succeeding the anvil.

There are many different types of scrolls since KE has came out here they are:
Low Upgrade Scroll ( LUS ) - Charon
Middle Upgrade Scroll ( MUS ) - Charon
High Upgrade Scroll ( HUS ) - Monster Dropped
Blessed Upgrade Scroll ( BUS ) - Charon
Trina ( Trina ) - Power Up Store

Using what scroll on what items

-Making Low class items : you use LUS to +7 then MUS to +8 Remember that BUS on a +7 to +8 on a LUS or MUS item does NOT help the percentage of the item succeeding.

-Making Middle class items : Depending on the item i usually use the HUS from +1 to +2 for simple fact can usually find the HUS for 10K-20K cheaper then from +2 to +7 using MUS then +7 to +8 using BUS.

-Making High class items : If the item isnt something you really want to lose like for example a Shard or Raptor use BUS all the way but if its sometihng simple like a salamander staff or Priest Chitin ( Cheap high class items ) You can use this HUS to +1 to +2 then BUS from +2 to +8.

-Using Trina with items : Using trina's on items can get VERY expensive and should only be used when going to +7 to +8 on High class items , but some people use them from going to +6 to +7 cause there not wanting to lose there legit item.

Items and their percentages

Everyone knows the Percentages are always random but can be calculated to make a certain ratio of succeeding. Here is a list of percentages using scrolls from MY experiences and many have agreed.

LUS from:

+1 to +2 = 100%
+2 to +3 = 100%
+3 to +4 = 75%
+4 to +5 = 63%
+5 to +6 = 50%
+6 to +7 = 25%
+7 to +8 = 8%

MUS from:

+1 to +2 = 100%
+2 to +3 = 100%
+3 to +4 = 75%
+4 to +5 = 63%
+5 to +6 = 50%
+6 to +7 = 25%
+7 to +8 = 8%

BUS from:

+1 to +2 = 100%
+2 to +3 = 100%
+3 to +4 = 75%
+4 to +5 = 63%
+5 to +6 = 50%
+6 to +7 = 25%
+7 to +8 = 8%

HUS from:

+1 to +2 = 90%
+2 to +3 = 75%
+3 to +4 = 50%
+4 to +5 = 25%

Trina And BUS from:

+1 to +2 = 100%
+2 to +3 = 100%
+3 to +4 = 100%
+4 to +5 = 90%
+5 to +6 = 75%
+6 to +7 = 50%
+7 to +8 = 25%

Elemental damage and Stat scrolls are roughly around 95% but have been known to fail twice in a row occasionally.
Changing elemental damage on staffs is 100% succeeding so no need to worry about your staff ever breaking.
Creating items to +9 is a very low possibilty and to +10 is like a 1% succeeding ratio.

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What about +8 to +9?

its very hard like 1% and +9 to +10 is 0.01%

i think som1 should make a hack that gives you 100% all the way to +10

if i could id make 1 do this site have a program to make hacks? we should make 1 if we dont cuz thatd be awesome although itd probably be hard to use... how do ppl make hacks with out a program for it anyway???