Fear Itself

 is a technique and is often referred to as Senku's most innovative technique. It allows him become "Fear Itself" as such he enjoys a range of abilities. Fear Itself as often been referred as Senku's own form of an enhanced Sage Mode.

Overview
The user fuses natural energy along with their normal chakra to drastically empower all of their abilities. This is more of a transformation than mode. The technique requires the user to smear their own blood into the ground in order to transform. Once transformed all of their abilities are empowered beyond the limits of any Shinobi. The user grows in size and his shape is greatly altered making them look like monsters. While using this, the user's perception abilities and reflexes dramatically increase. The user experiences a drastic increase in flexibility. The user's body experiences a monumental acceleration in the healing process. The user can sense and manipulate the dread, fear, horror and terror, of themselves, people, animals and other creatures, whether by increasing, decreasing, causing or otherwise channeling fear, even manifesting the emotional energy to physical level. They can cause others fear even the most harmless of things to the point of becoming catatonic. They are able to augment the fears in others, increasing the targets fears, potentially amplifying them to the point of the victim dies of fright, usually a heart-attack.

They can evoke and increase fear and horror in others causing the target’s brain to release fear-inducing chemicals.

The victim’s perception may be altered, causing them see their environment as ominous and the user as dark and foreboding, or even seen as a monster. They become stronger, faster, more durable and gains self-sustenance. Through fear of oneself and others. They can bring the fears of their own and the fears of others to life. The creatures created will gain the life of their own, or possibly attack the user specifically due to their fear of them. The user can generate aura of fear that can amplify or induce terror on beings inside their aura and gain power from the emotions. The user can discern and instantly understand the greatest fears of other beings. They are able to truly observe the most hidden of fears within an opponent and use those fears to their advantage.

They can gain abilities that are related to a targets fears. The shift may just be aesthetic or the user will gain all the powers and the form of the feared being or object. User can become an physical manifestation or personification of fear and gain power from the fear in others or oneself. They can enter and manipulate the nightmares of others, including modifying, suppressing, fabricating, influencing, manifesting, sensing, and observing nightmares.