With its requirements met (Str 9 · Dex 11), Reverse-Bladed Sword reaches 318 attack rating at +25; the strongest affinity at those stats is Sacred at 488.
Standard affinity at max upgrade, each weapon at its own requirements. A full bar is the class's strongest (Curseblade's Cirque, 385).
Moveset from the game files
Damage with Standard +25 at the stats above, before the enemy's defense; two-handed moves include two-handing's Strength bonus. MV (motion value) is the hit's share of attack rating (100 = all of it).
One-handed17players can parry them
Move
MV
Damage
Stance
Stamina
1st hit
R1 1Slash
100
318
5
13
0.40 s
R1 2Slash
101
322
5
13
0.47 s
R1 3Pierce
102
325
5
13
0.47 s
R1 4Slash
103
328
5
13
0.43 s
R1 5Slash
104
331
5
11
0.40 s
R1 6Slash
110
350
10
11
0.53 s
R2Slash
125
398
10
22
—
Charged R2Slash · 2 hits
160 + 160
1,020
60
33
1.07 s
R2 2Slash
125
398
10
22
—
Charged R2 2Slash · 2 hits
125 + 135
829
30
33
1.13 s
Running R1Slash
105
334
5
26
0.60 s
Running R2Slash/Pierce · 2 hits
102 + 115
691
10
33
0.40 s
Rolling R1Slash
90
286
5
11
0.33 s
Backstep R1Slash
90
286
5
11
0.40 s
Jumping R1Slash
107
341
7.5
11
0.33 s
Jumping R2Slash
127
404
10
0
0.40 s
Guard counterSlash · 2 hits
75 + 130
653
30
33
0.53 s
Two-handed17players can parry them
Move
MV
Damage
Stance
Stamina
1st hit
R1 1Slash · 2 hits
90 + 90
573
6
17
0.33 s
R1 2Pierce/Slash · 2 hits
91 + 91
580
6
17
0.40 s
R1 3Slash · 2 hits
92 + 92
586
6
17
0.47 s
R1 4Pierce
107
341
6
17
0.53 s
R1 5Slash/Pierce · 2 hits
93 + 93
593
6
14
0.40 s
R1 6Slash · 2 hits
94 + 94
599
12
14
0.50 s
R2Slash · 2 hits
97 + 97*
618
12
27
—
Charged R2Slash · 2 hits
108 + 108
688
33
40
1.17 s
R2 2Pierce/Slash · 2 hits
98 + 108*
656
12
27
—
Charged R2 2Pierce/Slash · 3 hits
78 + 102 + 86
848
33
40
1.17 s
Running R1Slash · 2 hits
91 + 93
586
6
33
0.60 s
Running R2Slash/Pierce · 4 hits
50 + 50 + 88 + 88
880
12
54
0.37 s
Rolling R1Slash · 2 hits
88 + 88
561
6
15
0.33 s
Backstep R1Pierce/Slash · 2 hits
89 + 92
577
6
15
0.50 s
Jumping R1Slash · 2 hits
86 + 86
548
9
14
0.33 s
Jumping R2Slash · 2 hits
99 + 99
631
22
27
0.43 s
Guard counterPierce/Slash · 4 hits
96 + 78 + 98 + 80
1,122
33
54
0.47 s
Criticals2
Move
MV
Damage
Stance
Stamina
1st hit
BackstabPierce · 2 hits
50 + 220
860
0
19
0.53 s
RipostePierce · 2 hits
50 + 300
1,116
0
19
0.93 s
Skill: Blind Spot1move names inferred
Move
MV
Damage
Stance
Stamina
1st hit
Skill (variant)Pierce
145
462
10
30
0.63 s
From the player's animation events, BehaviorParam_PC and AtkParam_Pc. First hit: seconds at normal speed from the start of the move's animation (uncharged R2s start from a released charge, so they show —). Criticals include the weapon's critical multiplier. * The elemental motion value differs from the physical one shown; the damage uses each.
By upgrade level (Standard)
Level
AR
Physical
Cost
+0
125
125
—
+1
132
132
Smithing Stone [1] × 2
+2
140
140
Smithing Stone [1] × 4
+3
147
147
Smithing Stone [1] × 6
+4
155
155
Smithing Stone [2] × 2
+5
162
162
Smithing Stone [2] × 4
+6
170
170
Smithing Stone [2] × 6
+7
177
177
Smithing Stone [3] × 2
+8
185
185
Smithing Stone [3] × 4
+9
193
193
Smithing Stone [3] × 6
+10
200
200
Smithing Stone [4] × 2
+11
208
208
Smithing Stone [4] × 4
+12
216
216
Smithing Stone [4] × 6
+13
224
224
Smithing Stone [5] × 2
+14
231
231
Smithing Stone [5] × 4
+15
239
239
Smithing Stone [5] × 6
+16
247
247
Smithing Stone [6] × 2
+17
255
255
Smithing Stone [6] × 4
+18
263
263
Smithing Stone [6] × 6
+19
271
271
Smithing Stone [7] × 2
+20
278
278
Smithing Stone [7] × 4
+21
286
286
Smithing Stone [7] × 6
+22
294
294
Smithing Stone [8] × 2
+23
302
302
Smithing Stone [8] × 4
+24
310
310
Smithing Stone [8] × 6
+25
318
318
Ancient Dragon Smithing Stone × 1
From +0 to +25: 12 Smithing Stone [1], 12 Smithing Stone [2], 12 Smithing Stone [3], 12 Smithing Stone [4], 12 Smithing Stone [5], 12 Smithing Stone [6], 12 Smithing Stone [7], 12 Smithing Stone [8], 1 Ancient Dragon Smithing Stone.