Dormin says the following upon retrieving the item:
That is the "Cloak of Deception"...
By using it, thou shalt become invisible to the colossus...
As stated above, wearing the Cloak of Deception renders the player completely invisible. While invisible a colossus will not be able to attack Wander, but if he shoots at one with his bow & arrow it may realize where he is and look (in Malus' case: aim) at him. If Wander starts climbing a colossus, it will instantly realize it and start shaking him off.
The Cloak of Deception makes Wander completely invisible, even to the player. The only thing the Cloak does not hide is his shadow, which allows the player some idea of where Wander actually is. Also, the Cloak of Deception cannot be used in conjunction with the Cloak of Force.
- If a player begins a colossus battle while wearing the Cloak of Deception, focusing the camera on its eyes will show that they are not illuminated. Instead they will be completely black, much like when when a colossus is defeated.