The Torch provides a source of light and fire. Though not upgradable, it's valuable early in the game for distracting guards and lighting up dark spaces.
Traps are non-lethal explosives useful for crowd control and creating diversions. They can be upgraded for added lethality and larger ammo capacity.
Silent and effective, the Blowdart lets you incapacitate enemies from a distance. Upgrades include poison and sleep-inducing darts.
Smoke bombs are versatile, allowing you to create a cloud of smoke to evade detection. Upgrades include healing properties and silent impact.