Clan: Senninken Clan
Kekkei Genkai: Cursed Seal
Elements: Any
Specialization: Fuuinjutsu, and any other

Location: Scattered

Clan History: Once upon a time, there was a ninja who fought against a puppeter who was reknown for his poisons in the First Shinobi World War. That man‘s name was Senninken Jikodou. After a deadly fight, Jikodou was the winner, but he was poisoned without knowing. Soon he had a son named Haolen. He was born with a seal on his neck. After Senninken Jikoudou died in afight, Haolen didn‘t know what to do.

In a night, he woke up in the middle of nowhere, full of blood on his hands. He knew that somerhing wasn‘t right so he decided to find out. After more nights like these, Haolen came to a conclusion : he had a power that he couldn‘t control. He studied the seal he had on his neck and he named it "The Cursed Seal". After a couple of years he managed to control it. There was no problem with it for some time.

Soon he became a ninja, rapidly gaining up in rank, becoming a jounin and one of the best Shinobi in Konohagure. Haolen became to wonder if there's still more power in that seal. He started to train for some time and he had become a succesful shinobi. One night, he woke up again in the same problem : he was again full of blood. The people started wondering about who would he able to do this. Haolen started to train on his cursed seal again, sleeping while he was in a seal that would stop him from moving. That way he could save more people from his bloody desire.Within some months, he was able to get the full transformation of the cursed seal control.

Soon, the villagers found out that he was the one behind the masacre that happened some months ago. Haolen was pointed as a missing-nin for what he had done. He ran away from the Village, promising that one day, he will come to take his revenge on the Konohagure.

Kekkei Genkai Description: The user is born with a cursed seal on his body (he needs to say where in his jutsu application). This Cursed Seal has more Stages:
First Stage
In this stage, the user is covered with some little parts of that cursed Seal. The user gets a +1 in his secondary specialisation, allowing him to use more potent moves.
Second Stage
In this stage, the user is completly covered by his cursed seal. Besides his +1 in the secondary specialisation he also gets a + 1 in his secondary element. Also, he gets the special traits (The way he looks after the transformation. They can add special mutations for them. They will be posted in the description of the "Cursed Seal Activation") and the special jutsus for his transformation.

How to get it
Well, this technique can only be achieved in one way. The only way for the Clan's members to get it :  They need to create a jutsu that is name like this : "Cursed Seal : 'Name of Your Cursed Seal'." At the description you will describe the appearance of that jutsu and how does it change YOUR appearance when you're at the Second Strange. You will then need to train using 1000 Words and then post it back for approval.

The rank u cost is as follows for the ativation jutsu
D-C- 1500 words
C-B- 2000 words
B-A- 3000 words
A-S- 5000 words

Drawbacks: The Cursed Seal is already considered a Senjutsu-like transformation. That means the users who have the cursed seal can't learn Senjutsu
Members: None at the moment

Kekkei Genkai Jutsu: Name: Cursed Seal Activation
  Canon/Custom: Custom
  Rank: D-S
  Type: Supplementary
  Element: N/A
  Range: Short Range
  Specialty: Fuuinjutsu
  Duration: Depends
  Cooldown: 3 posts l l +1 per rank
  Description: This jutsu allows the user to use the Cursed Seal Technique.Depending on the Rank, this jutsu has different effects:

D-Rank : The User only has the First Stage transformation that is auto-activated when the user drops below 50 chakra. He can't control it. (the user attacks any enemy he sees without hesitatino and is easily angered)The cursed seal can only be used 5 posts and then the user becomes unconscious for 5 posts. Once activated, It can't be stopped.
C-Rank: The User only has the First Stage Transformation and he is able to control it. It can only be activated when the user's chakra drops below 100 Chakra. The Cursed seal can only be used for 6 posts.Once activated, It can't be stopped. After these turns, the player becomes unconscious for 5 posts.
B-Rank: The user has both the second stage and the first stage. He can only control the First Stage and the second one is auto-activated when the players loses 50 chakra in the First Stage. Once activated, The first stage can be stopped whenever the user wants, but the second stage can't be stopped. The second stage can only be maintaned for 5 posts, then, the user falls unconscious. The first stage is usuable for up to 10 posts.
A-Rank : The user is has both the First and the Second Stage. The First Stage can be activated whenever he wants and the Second Stage can only be activated when the user's chakra drops below 70 chakra. The user then falls unconscious after using the second Stage for 7 posts;
S-Rank : The user is able to control both of them and he can activate them whenever he wants. Also, he can use the cursed seal on some parts of the body, without completly transform;
[Please Reffer here to your appereance in the second stage and the appereance of your cursed seal.]

All of the ideas for this clan and jutsus were made by Owydelu, I just fixed up the issues

Ready for check up

For being able to get +1 to a specialization, then eventually a +1 to element as well requires heavier drawbacks than what you have down. Be so kind as to include some?
Sense it is the jutsu that is giving the boost, the jutsu would need the balance not the clan... also the details of the jutsu shouldn't be in the clan's KKG section.

Unfortunately, the cursed mark system is something that is going to be worked on and published by staff. It has been attempted as a clan before and it ended up never getting through. When a write up for cursed seals has been completed and approved by staff it will be released to the public. Until then we'll need to hold off on this clan for a bit.