Sense is a term that refers specifically to the five traditional senses (sight, hearing, taste, smell and touch) and the ones that relate to the burning of the Cosmo (intuition, miraculosity, arayashiki and godhood). In the Saint Seiya series, senses are used to measure the level of cosmo and the state of being of characters.
The Five SensesEdit
Sight (eyes), hearing (ears), taste (mouth), smell (nose) and touch (nerves) are the senses which most human beings are born with, and encompass their activities in life (so long they don't awaken intuition). All five senses can be taken through physical attacks, and are all irrelevant in the underworld (especially after death). Despite not being considered as much as the remaining senses, they are vital for most human beings, and their very use consumes the naturally existing cosmo in all life forms.
The Sixth SenseEdit
Intuition is the sense that represents the strength of Athena's Saints, and is inherent to all who can feel their own Cosmo and/or that of others. Its basic use is what differs cosmo-awakened fighters from regular ones, as things like feeling and using cosmoenergy, moving at superhuman speeds and predicting movements without the use of other senses is impossible without it. With this sense, supplementary abilities such as the sekishiki, energy manipulation (offense & defense), telekinesis, teleportation, crystal manipulation, temporary flight, mind reading, atomic manipulation and destruction, temperature manipulation, nature manipulation & communication and the elements may be developed. Such skills are often even seen as sub-senses of the sixth, and may be heightened (or, as with sekishiki and teleportation, impossible without) certain characteristics of the individual's biology.
Additionally, the sixth sense can replace the loss of the previous 5 during a fight, as demonstrated when Virgo Shaka used his Tenbu Hōrin to take Phoenix Ikki's senses (in the occasion, the sense is later taken as well).
The Seventh SenseEdit
Miraculosity is the highly mentioned Seventh Sense that gives its user access to the essence of their Cosmo. In short, it can be described as the "true" Cosmoenergy, and its use brings about what could be considered impossible (called a miracle in the Saint Seiya series). This sense is extremely rare even among Cosmo users (such as Saints, Specters and Berserkers), and is considered the power that separates the Gold Saints from all the others. The term "miracle" is used to refer to the acts that go against nature, such as moving one's body at the speed of light, taking off all of the heat in a particle (and thus approaching and even generating the absolute zero) and opening gaps in spacetime. In fact, even if a mortal fights against a god or otherwise incredibly powerful being, they may become equals with them through the use of miraculosity, even if for only a second. The same goes for all those capable of this sense, regardless of rank. Its use can replace that of any previous senses, and only extremely powerful beings (such as Virgo Asmita and Athena) can take it away from a person.
In the age of myth, in which distinction between gods and humans was unheard of (see "ninth sense"), humans in general had access to the seventh sense, which in fact was originally theirs (much to the dismay of many of the gods). With the development of civilization by the majority of humans and ascension of the gods, miraculosity was forgotten by most, although it exists in a sutile form in the very life sources of Earth.
The Eighth SenseEdit
Arayashiki is, primarily, the sense which allows the dead to perform basic tasks and feel pain and suffering while in the underworld. It is linked to reincarnation, dead consciousness and the first steps of godhood (so much that the ones who approach it are often referred to as "close to the gods"). Naturally, this sense would only awaken after death, when all other senses are lost, and wouldn't allow human consciousness to remain while in the form of a soul. However, it is possible to achieve the eighth sense while alive, in which case the user can even keep their consciousness after reaching the underworld, which is also possible with certain items and blessings that simulate its activation, such as the blessing of Hades (shared by Specters and their undead Surplices), Sasha's flower bracelets (as shown by Pegasus Tenma) and Athena's Sword (a demonstrated by Unicorn Yato). Additionally, the early awakening of the arayashiki can give its user even greater reserves of cosmoenergy (as shown by Sagittarius Sisyphus). Virgo Asmita, the previous Virgo Saint, was the only being shown to be capable of removing the eighth sense, which he did to Atavaka, effectively destroying his capacity to reincarnate as a specter. The Mokurenji was known as the only living being in the underworld, and its unique ability was used to seal the souls of specters. Rarely, human souls may keep their consciousness even dead, and that is linked to an inherent capability to reach this sense. Such an ability is poorly explained in the series, but the status of the Virgo Saints as reincarnations of Buddha himself is connected to it.
The Ninth SenseEdit
Godhood or divinity is the "supreme virtue", and the sense that separates a god from lower beings. To awaken such sense, a mortal must reach true enlightenment, of the likes of which rarely ever happened after the age of myth. In those times, in which all of humanity possessed the power of miraculosity, some managed to awaken their ninth sense, becoming the deities known to men in modern times (all of them, with the possible exception of Chaos, Chronos and other primordial gods, were said to be originally humans). Very few mortals can approach the power of godhood in modern times, and most possess special circumstances or abilities (whether acquired, such as Virgo Shaka's training and the Bronze saints' God cloths, bathed in Athena's blood; or inherited, such as the presence of Kairos' genes in Pegasus Tenma's body). The miracles generated by the Cosmoenergy of a god are capable of not only breaking laws of physics, but also completely ignore them. An example of this was shown when Poseidon could stop the absolute zero-enhanced blast of the Aurora Execution of Cygnus Hyoga and bounce it back, when no particle should be able to retain energy within it. In the occasion, his cosmo was yet to be completely awakened, and when it did, it was noted by Pegasus Seiya to multiply itself at an alarming rate, quickly enveloping all of his Underwater Sanctuary. His power was also capable of literally "ordering" the golden arrow of the Sagittarius Cloth to obey his will, until it was surrounded by the combined cosmoenergy of Pegasus Seiya, Cygnus Hyoga, Andromeda Shun and Dragon Shiryu.