Aran 3rd job skill build

70 - Full Swing (1)
71 - Full Swing (4)
72 - Full Swing (7)
73 - Full Swing (10)
74 - Full Swing (13)
75 - Full Swing (16)
76 - Full Swing (19)
77 - Full Swing (20 - MAXED), Critical Combo (2)
78 - Critical Combo (5)
79 - Critical Combo (8)
80 - Critical Combo (11)
81 - Critical Combo (14)
82 - Critical Combo (17)
83 - Critical Combo (20 - MAXED)

The skill build beyond this point is pretty much up to your playing style. Since you're nearing Lv90 at this point, I would suggest adding Snow Charge so that you can take on Bains when you reach that level. But since Snow Charge doesn't freeze, it's up to you.

84 - Snow Charge (3)
85 - Snow Charge (6)
86 - Snow Charge (9)
87 - Snow Charge (12)
88 - Snow Charge (15)
89 - Snow Charge (18)
90 - Snow Charge (20 - MAXED), Final Toss (1)
91 - Final Toss (4)
92 - Final Toss (7)
93 - Final Toss (10)
94 - Final Toss (13)
95 - Final Toss (16)
96 - Final Toss (19)
97 - Final Toss (22)
98 - Final Toss (25)
99 - Final Toss (28)
100 - Final Toss (30 - MAXED), [1 SP remaining]

Again, there are two possible ways of continuing. One is based on Offense, and the other Defense.

Build 1: Offense

100 - Fenrir Phantom (1)
101 - Fenrir Phantom (4)
102 - Fenrir Phantom (7)
103 - Fenrir Phantom (10)
104 - Fenrir Phantom (13)
105 - Fenrir Phantom (16)
106 - Fenrir Phantom (19)
107 - Fenrir Phantom (22)
108 - Fenrir Phantom (25)
109 - Fenrir Phantom (28)
110 - Fenrir Phantom (30 - MAXED), Smart Knockback (1)
111 - Smart Knockback (4)
112 - Smart Knockback (7)
113 - Smart Knockback (10)
114 - Smart Knockback (13)
115 - Smart Knockback (16)
116 - Smart Knockback (19)
117 - Smart Knockback (20 - MAXED), Rolling Spin (2)
118 - Rolling Spin (5)
119 - Rolling Spin (8)
120 - Rolling Spin (11)

Build 2: Defense

100 - Rolling Spin (1)
101 - Rolling Spin (4)
102 - Rolling Spin (7)
103 - Rolling Spin (10)
104 - Fenrir Phantom (3)
105 - Fenrir Phantom (6)
106 - Fenrir Phantom (9)
107 - Fenrir Phantom (12)
108 - Fenrir Phantom (15)
109 - Fenrir Phantom (18)
110 - Fenrir Phantom (21)
111 - Fenrir Phantom (24)
112 - Fenrir Phantom (27)
113 - Fenrir Phantom (30 - MAXED)
114 - Smart Knockback (3)
115 - Smart Knockback (6)
116 - Smart Knockback (9)
117 - Smart Knockback (12)
118 - Smart Knockback (15)
119 - Smart Knockback (18)
120 - Smart Knockback (20 - MAXED), Rolling Spin (11)

End Result:
Full Swing - 20 (MAXED)
Critical Combo - 20 (MAXED)
Final Toss - 30 (MAXED)
Fenrir Phantom - 30 (MAXED)
Snow Charge - 20 (MAXED)
Smart Knockback - 20 (MAXED)
Rolling Spin - 11