Sneaking is a basic ability all characters are allowed to do. Sneaking can be improved through leveling the ability score, or by using equipment, which buffs it. Sneaking can be started by using the Hot Key "C" (by default) or clicking the sneak button on the UI. When a character enters into sneak mode, areas that are not seen by NPCs are shaded with a dark color, whereas any LOS cone belonging to an NPC is seen in a red colored hue. If you enter into an area which is within a NPC's LOS your sneaking will fail and they will see you.