Styx plies his trade in the slum town of Thoben, which is infested with goblins. There, a goblin hunter named Helledryn hires Styx to steal a magical scepter from an ambassador to the dark elves, with the promise of amber as payment. Styx breaks into the ambassador's airship, but before he can grab the scepter, a shapeshifting dark elf takes it first. He attaches a large crystal to the staff and uses it to paralyze Styx. He then shapeshifts into a human and raises the alarm, forcing Styx to flee empty-handed.
Like its predecessor, Styx is able to clone himself and to lay traps for his enemies, and can temporarily turn invisible. The player has the option of engaging enemies or avoiding them. Ropes and grappling hooks can be used to reach high areas. There is also a multiplayer co-op mode, with the second player controlling one of Styx's clones.