Clan History: Many years ago, after the creation of Kirigakure, there was a man with a strange interest in the spirit realm. He read books about the dead, hunted for ghosts, and even tried to revive the dead. Many looked down upon him for his actions, but he wasn't one to care for others opinions. He had one goal in life, that was becoming one with the spirit realm. What he wanted, in a sense, was to become a phantom, or more specifically, a living spirit.
His obsession started when he was a young boy. He'd "operate" on dead animals, attempting to restore the life inside of them. His obsession was spiked tremendously after his wife, Himiko, had died, leaving him and his son alone. After her death, he wanted nothing more than to be with her again. He conducted many experiments on his bodies, and the bodies of the dead. He wanted one of the two to happen: he revived his wife, or he found a way for him to be with her in the spirit realm. After conducting many concoctions that he thought would work and would bring him to a state where he could visit his wife and come back to his son, he though it'd be a great idea to conduct his experiments on his son and the rest of his clan.
Eventually, after YEARS, of experimentation, alteration of his own and his son's blood, he discovered that he was able to use ninjutsu. He used that and his altered blood to conduct a jutsu that could take him to the spirit realm. He was not only able to see the spirits of the dead, he was able to communicate with them. He also found that his real body would be left in a seemingly lifeless state. He also found that he was able to use other ninjustu in this state, but it would take a giant toll on him mentally and physically. It took a while for him to master, as he would often find himself stuck in the other world. He taught this jutsu to his son at the tender age of 17, and once his son became a man and had children of his own, he saw that his son would often disconnect from his body, going into the spirit realm. When his son was old enough to use ninjutsu, he taught him this special jutsu that would allow him to control when he would disconnect from reality and into the spirit realm.
After generations of the same bloodline, they eventually adapted the last name Fantomu, which literally translates to phantom. This clan's jutsu is often compared to that of the Yamanaka, though they differ. This clan is now acclaimed for their unique ability, and are a major asset to the Hidden Mist Village.
Kekkei Genkai Description: Fantomu members are able to ascend into the spirit realm, giving their phantom body a +1 tier attribute boost in strength, and allowing them to do a number of things. They are able to communicate with the living and the dead, and attack. They can touch both spirits and humans physically. The living and the dead, however, are also able to communicate with them. Their phantom forms are able to be harmed physically. They take normal amounts of damage, but the damage taken in the phantom form does not hurt the user's living body. The clan uses their special Jutsu, Jōshō, to perform their ascension. Jōshō is a jutsu that releases clan members of their physical form, and takes them into a phantom form. They are able to phase through inanimate objects.
Drawbacks: When going into the spirit realm, their actual body is left seemingly lifeless. Their actual bodies are left vulnerable to attacks while in this state. If one stays in their phantom form for an amount of time that is beyond their ability, they will be trapped there forever.
Description:This is a jutsu known only to the Fantomu clan members. Through the use of ninjutsu, chakra control, and their unique bloodline, they are able to ascend their souls into a phantom form, leaving their bodies seemingly lifeless. Their phantom forms have the same amount of HP as their normal body. They are able to attack anyway they so choose in this form. If it is known to them, they are able to you any jutsu that they know, taijutsu, seijutsu, bukijutsu, etc. Fantomu members aren't able to be within 6 inches of their normal body while in phantom form, or they will be forced back into their human form. Fantomu members lose their strength boost when introduced to bright light. Their strength boost lowers their speed by 1 tier. Their ghost forms are weak to water type jutsu. Water type jutsu do +2 tier of damage to Fantomu members' phantom form.
Description:This is a jutsu known only to the Fantomu clan members. Through the use of ninjutsu, chakra control, and their unique bloodline, and their phantom form, they are able to pull enemies toward them, while the enemy takes short spurts of damage. This jutsu takes 5 chakra.
Description:This is a jutsu known only to the Fantomu clan members. Through the use of ninjutsu, chakra control, and their unique bloodline, they are able to create small orbs that are 3 feet in diameter at a maximum of one foot away from them. This jutsu is one that is able to absorb the damage that the user would have taken in their physical form. This is a scaling jutsu, so as the user ranks up, the orbs are able to absorb stronger attacks. They are able to absorb at most 2 attacks of the users rank, and double that for any attack given that is lower than its rank.
Description:This is a jutsu known only to the Fantomu clan members. Through the use of ninjutsu, chakra control, and their unique bloodline, they are able to summon the hands of necropolis, which are able to rip part of the soul out of the users target. The hands grip the piece of the soul that the user wishes to take away. The missing piece of the soul takes away an ability of the one that is being affected by the jutsu. The user of the jutsu is then able to eat the piece of the soul that was torn away, and gain that ability.
This clan reminds me a lot of the Ishido clan.
Though with a lot more of a mystical element, (something which could be added as the note of a personal nature to a character rather than as a clan thing.) Just as a heads up if you wanted to go by that option.
As for your KKG description. We don't use %'s here, we use a tier system which is described by our guidelines section. A strength increase for a clan would likely be +1 - +2 tiers. Not 10% Also, something like a ghost form would have to be a jutsu which would cost chakra, you'd have to describe what it could do and what it couldn't, but such a strong buff to strength and the added bonuses of being ghostlike, which, i would assume would be self explanatory (mostly) would make that jutsu hellishly strong.
Another clan that Uses Ghost / Undead type stuff is the Shiki Iga clan, if you wanna go by them.
I give you these easy outs as you seem to be new, and continuing this project with such an advanced KKG is going to take a fair amount of work, and thus time. I'm fully available to work through it with you ^_^ but you might want to get to writing is all.
Alright, lets go through this step by step.
what other things can they do? The jutsu says nothing of the sort.
You're all saying this as if it's lead on from this jutsu, might wanna break it apart into seperate sections.
if they can be harmed in phantom form but it doesn't hurt their body, then what is the point?
Some of your jutsu names are just poor english-romanji translations. Just a heads up. Soul Grip especially.
Ascention Tech: Does a LOT. also, why does it scale? what does the scaling do for you? you can only have one scaling and one S-SS technique, you have two, you need to pick one. There's no HP stat on this site, so, you can remove that mention, but can say they retain any damage. Also, note, that anything like floating, hovering, moving through things etc, WILL NEED to be stated in this jutsu and will contribute to its strength, and thus balancing.
Ghastly Grip: what damage? what kind of pull? What range? how are they pulled, so much more info is needed here. This needs to be a lot more whole.
Orb: Who is them? the user or target? This can't be a scaling jutsu, you already have one. how do they absorb attacks? Is it a barrier? can they move? how fast?
Soul grip: Same thing here, can't have another SS rank (Or S rank.) Needs speeds, description, and everything the others do.