Subterfuge
Subterfuge is a combat skill. The Rogue's stealth, poisons and ambushes.
Like every skill it climbs to level 99. XP Boosts (+30%) and the Captain's Subscription (+20%) stack, for +50% XP while both are running.
Abilities

Leap to the target, 220% damage, far stronger from behind or stealth, +20% crit chance.
8 s
Elite: massive single-target damage, doubled from behind or stealth.
35 s
20% damage to up to 4 enemies around the target (5 m), distracts.
20 s · 5 m area
Heals you for 25%, stealth for 2 s.
25 s
300% damage, bleeds for 8 s, far stronger from behind or stealth, +25% crit chance.
14 s
3 waves of 120% damage to up to 4 enemies around you (7 m), poisons for 10 s.
18 s · 7 m area
Vanish for 8 s. Monsters lose you; your next strike breaks it.
25 s
140% damage, poisons for 10 s.
10 s
Shadow-step behind your target and strike.
12 s
2 waves of 90% damage to up to 4 enemies around you (5 m).
14 s · 5 m area
Smoke hides you and 3 allies for 3 s and they heal over 6 s.
30 s · 10 m area
Heals you and 3 allies for 25%, heals over 8 s.
22 s · 15 m area
Vanish, then a five-strike burst from the shadows. If it survives, you escape 20 m away, invisible, and it is left badly poisoned.
0 s
A six-strike shadow burst that also cuts 3 enemies nearby, then an invisible escape and deep poison.
0 s
Eight lightning strikes through your target and 6 others, then gone into the dark, leaving them all poisoned.
0 s