Grade Probabilities

More information about grade effects and other useful information can be found on Hazy-Forest.com.
This information was directly taken and translated from kRO website.

Grade Enhancement	No Grade > D Grade	D Grade > C Grade	C Grade > B Grade	B Grade > A Grade
Blessed Etel Dust	1% per 1 unit (up to 10%)	1% per 3 units (up to 10%)	1% per 5 units (up to 10%)	1% per 7 units (up to 10%)

• When an Blessed Etel Dust is used, the bonus success chance is added to the base chance.

Weapon (General)

Refine Level	No Grade > D Grade	D Grade > C Grade	C Grade > B Grade	B Grade > A Grade
9	10.0000%	-	-	-
10	20.0000%	20.0000%	-	-
11	70.0000%	60.0000%	50.0000%	40.0000%
12	70.0000%	60.0000%	50.0000%	40.0000%
13	70.0000%	60.0000%	50.0000%	40.0000%
14	70.0000%	60.0000%	50.0000%	40.0000%
15	70.0000%	60.0000%	50.0000%	40.0000%
16	80.0000%	70.0000%	60.0000%	50.0000%
17	80.0000%	70.0000%	60.0000%	50.0000%
18	80.0000%	70.0000%	60.0000%	50.0000%
19	80.0000%	70.0000%	60.0000%	50.0000%
20	80.0000%	70.0000%	60.0000%	50.0000%

Weapon (Event)

Refine Level	No Grade > D Grade	D Grade > C Grade	C Grade > B Grade	B Grade > A Grade
9	20.0000%	-	-	-
10	30.0000%	30.0000%	-	-
11	80.0000%	70.0000%	60.0000%	50.0000%
12	80.0000%	70.0000%	60.0000%	50.0000%
13	80.0000%	70.0000%	60.0000%	50.0000%
14	80.0000%	70.0000%	60.0000%	50.0000%
15	80.0000%	70.0000%	60.0000%	50.0000%
16	90.0000%	80.0000%	70.0000%	60.0000%
17	90.0000%	80.0000%	70.0000%	60.0000%
18	90.0000%	80.0000%	70.0000%	60.0000%
19	90.0000%	80.0000%	70.0000%	60.0000%
20	90.0000%	80.0000%	70.0000%	60.0000%

Armor (General)

Refine Level	No Grade > D Grade	D Grade > C Grade	C Grade > B Grade	B Grade > A Grade
9	10.0000%	-	-	-
10	20.0000%	20.0000%	-	-
11	70.0000%	60.0000%	50.0000%	40.0000%
12	70.0000%	60.0000%	50.0000%	40.0000%
13	70.0000%	60.0000%	50.0000%	40.0000%
14	70.0000%	60.0000%	50.0000%	40.0000%
15	70.0000%	60.0000%	50.0000%	40.0000%
16	80.0000%	70.0000%	60.0000%	50.0000%
17	80.0000%	70.0000%	60.0000%	50.0000%
18	80.0000%	70.0000%	60.0000%	50.0000%
19	80.0000%	70.0000%	60.0000%	50.0000%
20	80.0000%	70.0000%	60.0000%	50.0000%

Armor (Event)

Refine Level	No Grade > D Grade	D Grade > C Grade	C Grade > B Grade	B Grade > A Grade
9	20.0000%	-	-	-
10	30.0000%	30.0000%	-	-
11	80.0000%	70.0000%	60.0000%	50.0000%
12	80.0000%	70.0000%	60.0000%	50.0000%
13	80.0000%	70.0000%	60.0000%	50.0000%
14	80.0000%	70.0000%	60.0000%	50.0000%
15	80.0000%	70.0000%	60.0000%	50.0000%
16	90.0000%	80.0000%	70.0000%	60.0000%
17	90.0000%	80.0000%	70.0000%	60.0000%
18	90.0000%	80.0000%	70.0000%	60.0000%
19	90.0000%	80.0000%	70.0000%	60.0000%
20	90.0000%	80.0000%	70.0000%	60.0000%