Old War Stealthkit

The Old War Stealthkit is an Uncommon item in Risk of Rain 2. When taking damage, this item has a chance to turn the player invisible and give them a speed boost. The invisibility lasts for 3 seconds by default and an additional 1.5 seconds for each subsequent stack. The more damage you take, the higher the chance to activate.

The invisibility prevents enemies from targeting you, but certain attacks can still track and damage the player. The most obvious is the Stone Titan's laser.