A witcher possesses greater natural senses than any normal human, and Geralt’s have been honed over years of monster slaying. Whenever your adventure calls for it (indicated by an objective prompt in your quest, Geralt’s self-narration, or a clue from a quest you’re following), that may mean there’s something of interest that your Witcher Senses can reveal. Usually, Witcher Senses are used to spot possible evidence of a monster’s passing during a contracted hunt, but they can be used to find loot and herbs to pick in the field. You cannot use these senses while sprinting or riding at a full gallop. During combat (on foot), you can’t use Witcher Senses either, but you can while attacking on horseback; try choosing your next target from any surrounding threats while maneuvering between foes.
When using Witcher Senses, containers, chests, herbs, and any objects with which you can interact are usually highlighted with a yellow glow.
Enemies and quest-critical objects (including monster tracks found on contract hunts) are lit red.
Witcher Senses also display the location of monsters or people you can only hear. If you activate the senses and see a cluster of pulsing white circles in a nearby forest, you may have stumbled upon a group of enemies.