Jack was walking toward his room thinking about his Nen Ability. Jack has not developed any nen ability cause he was confused what ability to develop. He also asked Biscuit about nen ability. but she told him that nen abilities are very personal unless he is sure about what type of abilities to develop don't try to develop it.
jack has arrived in front of his room open the door and close it and sat on the sofa. he has already decided what ability to develop. As he is an Enhancer there are not may choices, he is also a from other world so he decided to develop an ability which he watched in an anime which also falls under his nen category.
His ability is called Haki which will be classified in two different abilities first ability Observation Haki Enhances senses to develop the sixth sense which used to sense living creatures and predict attacks of enemy. there will be limitations such as can only sense living creature, Have to fight with strong people to develop it, need to be in focus state.
Observation haki mainly involves Nen Categories such as Enhancement and Emission, Enhancement is mainly use to enhance senses and Emission is mainly use to supplement range of observation haki.
Second Ability will be Armament Haki which will Coat any part of body with armor or steel like thereby it increase attack power of user and also use to defend it can also use to reinforce objects such as knife which Jack like to use. it will also have limitations such as need to fight strong people to develop and can only improve in battle and consume more aura than usual.
Armament Haki mainly involve Categories such Enhancement, Emission and Transmutation. Enhancement while main one which enhance attacks and to defend attack while transmutation to change aura into steel like.
Of course every abilities has some limitation in anime gon abilities also have restriction such as he need to maintain a pose to release an attack have to say name to increase his power exponentially. People can bypass restriction of abilities with their will and innate talent.
Jack then sat on bed then started meditation to create his nen ability. He was meditation whole afternoon. then at night jack open eyes and said
"I finally created my own nen ability"
Then Jack goes to sleep due to tiredness and slept soundly whole night.
Jack woke up at morning then after getting a bath, jack started daily training and started to get familiar with hi nen ability first he used observation haki and he can sense upto 40 meters outside he can sense people outside only living beings.
After that he started to use armament haki which only cover small part but it contains great strength if he use inside room he might destroy the whole room so he will not use it. jack stops training and while thinking he said
" Now lets wait for match and test it on sai, he will be lucky if he is alive after the match"
after jack said that he started to do strength training for the body as body is most important thing for enhancer.
He packed his stuff and today he will try sky arena gym, jack has heard that sky arena gym is very advanced. Arriving at gym jack started to use various gym machines and after completing high intensity exercise he left the gym, jack is now hungry so he visited a restaurant ate large amount of food and then after paying the bill he left the restaurant and got to his room and started his daily nen practice. Jack continue this daily schedule until the day of match.
Today is day of match between jack and sai, Jack is now standing on arena opposite to him is sai. As umpire said start both side stared at each other sai is smiling at jack and was thinking "After i defeat this kid is will have seven wins then i will find another 3 scapegoat for my wins and then i can challenge floor master and after defeating floor master i will have all the money, status and power i want" and started to laugh unconsciously.
Jack started to move toward sai, and sai also know that now is not about thinking and started to confront Jack both side exchange moves jack was using observation haki whole time to dodge sai punches. sai was surprised that jack is stronger than he think and started to get serious and use his Nen Ability.
Sai left jack and got back down and takeout a antenna shaped which has needle at its end and try to focus his aura onto it. During this whole process jack started to think about which category sai belong to and when sai bring out an antenna he narrowed down category to conjurer or manipulator both are very tricky categories and also use gyo and also saw focused aura on the needle . sai focus his aura on antenna and started running towards Jack and tried to pierce antenna into jack skin. jack started to dodge and also thought it should be a trigger based ability which will trigger after coming in contact with jack body. must be a manipulator ability.
Sai got angry and confused about how jack can dodge every attack at tricky angle he was feeling as jack is reading his attacks. While jack was dodging the attack he started to use his second ability armament haki which he used to cover his fist and after dodging incoming kick he punch fist into sai.
Sai saw incoming punch which he cannot dodge because he was very close to jack so he use ken to cover the part of body which he think where jack attack gonna land but jack changed his punch trajectory at last movement and punched sai on to chest. because power was so great sai got thrown out of arena and crashed onto wall and passed out. Referee checked sai condition and saw the sai is passed out so he declare jack as winner. Walking out of arena jack thought power of armament haki is very great and to master armament haki and to form his combat style he need combat experience as thought Jack walk towards his room.