Double Stab

Thief

\begin{aligned} K&=0.7\left(0.1+\frac{\text{mastery rank}}{10}\right)\\ P&\sim U(\min(P_0K,P_0),\max(P_0K,P_0))\\ R&=\left(J+\frac{aP}{d_P}+\frac{S}{d_S}+\frac{A}{d_A}\right)(W+W_{\mathrm{ammo}})\frac{p(n)}{100}\\ D&=\operatorname{clamp}\!\left(\left\lfloor R\,\frac{100}{100+F}\,\frac{e}{\lambda}\,(1+b/100)\,c\right\rfloor,1,99999\right) \end{aligned}

Effect

Double Stab values
Rank	Damage %	Hits	MP
1	80	2	8
2	84	2	8
3	88	2	8
4	92	2	8
5	96	2	9
6	100	2	9
7	104	2	9
8	108	2	10
9	112	2	10
10	116	2	11
11	120	2	11
12	124	2	12
13	128	2	12
14	132	2	13
15	136	2	13
16	140	2	14
17	144	2	14
18	148	2	15
19	152	2	15
20	160	2	16

Rank	Damage %	Hits	MP
1	80	2	8
2	84	2	8
3	88	2	8
4	92	2	8
5	96	2	9
6	100	2	9
7	104	2	9
8	108	2	10
9	112	2	10
10	116	2	11
11	120	2	11
12	124	2	12
13	128	2	12
14	132	2	13
15	136	2	13
16	140	2	14
17	144	2	14
18	148	2	15
19	152	2	15
20	160	2	16

Rank	Damage %	Hits	MP
1	80	2	8
2	84	2	8
3	88	2	8
4	92	2	8
5	96	2	9
6	100	2	9
7	104	2	9
8	108	2	10
9	112	2	10
10	116	2	11
11	120	2	11
12	124	2	12
13	128	2	12
14	132	2	13
15	136	2	13
16	140	2	14
17	144	2	14
18	148	2	15
19	152	2	15
20	160	2	16

Rank	Damage %	Hits	MP
1	80	2	8
2	84	2	8
3	88	2	8
4	92	2	8
5	96	2	9
6	100	2	9
7	104	2	9
8	108	2	10
9	112	2	10
10	116	2	11
11	120	2	11
12	124	2	12
13	128	2	12
14	132	2	13
15	136	2	13
16	140	2	14
17	144	2	14
18	148	2	15
19	152	2	15
20	160	2	16