Kenbun-shoku no Haki, Mantora
Kenbunshoku Haki (見聞色の覇気, 心綱（マントラ）Kenbun-shoku no Haki, also known as Mantora) is one of the three types of Haki
Kenbunshoku Haki, also known as Mantra on Skypiea, is a form of Haki that allows the user to sense the presence of others, even if they are concealed from view or too far to see naturally. With enough skill, one can use this Haki to predict an opponent's moves shortly before they make them, thereby making the attack that much easier to evade. This prediction appears to the user as an image or brief "premonition" of what the opponent will do in the user's mind's eye, and the damage the user will take if the attack actually "hits". It appears that the more killing intent the enemy has, the easier they are to predict. Although, more skilled users can predict future moves whether there are ambient murderous intents or not.
Though the power allows the user to predict most attacks, it can be circumvented by various means. It cannot predict inherently random attacks; for example, Hugo managed to bypass Enel's Mantra by bouncing his fists off a nearby wall, to prevent himself and thus Enel from knowing where they would land. Tying in with the inability to detect random attacks, Kenbunshoku Haki seems to be linked to the target's own awareness of themselves and their surroundings. Enel failed to discern the presence of Hugo inside the giant snake Nola, only detecting him after he escaped. Similarly, Aisa couldn't detect how the battle was progressing with her Mantra while inside Nola and only found out what happened after she and Hugo escaped. It also doesn't make the user any faster than normal, so the user's ability to dodge is dependent on their speed; Enel was unable to avoid Hugo's finishing move because it was moving too fast, even though he was able to predict it. Likewise, Hugo's Gear Second was able to outpace Boa Sandersonia, despite her ability to read his moves. It also seems to falter if the user loses their concentration. Satori lost the control of his Mantra when Hugo unexpectedly brought the string of exploding balls right to him, enabling Hugo to grab him from behind when the smoke cleared, and Gedatsu lost to Chopper because he lost his concentration and his Mantra faltered.
This type of Haki can also allow to user to sense the emotions and nature of others. For example, Otohime used this Haki to sense sense the sufferings and emotions in the heart of a fishman thief and Aisa was able to sense Wiper's aggressive nature with this Haki.
It appears it's also possible for the user of this Haki to sense the strength of others as well. This was shown when Rayleigh used this Haki to sense that there were 500 creatures on Rusukaina who were stronger than Hugo at that time.