Ok, here's the rules for anyone who wants to make the cursed seals available in this RP.
First to create a Cursed Seal, you need to be of the Fuuinjutsu Master specialty. This is due to the difficulty in keeping a target alive in combination with the odd chakras it inserts into the body.
Second, you need to submit a good template for the curse seal. Yes, the template. Yes, you have to make the template for these baddies if you want them to come into play. This template will be up for review by the Admins, and if it is good enough, just look below. In other words, you need to actually PM an admin your application before posting it, to save staff members a headache.
Third, if your template has been approved for review, you are allowed to post your thread in this section. This seal should then be submitted according to the template you sent the staff member, with minimal to no changes to get confusion out of the equation. If you are trying to get a seal that has already been made approved, you must dedicate a thread to learning it from the creator, or have written permission to learn it through a scroll. Through this method, a master may teach a seal specialist one Cursed Seal, overriding the rule that only masters can place Cursed seals.
Elaborating on one facet, the person creating the first seal of the type creates the template for further applications in learning it. However, due to everyone learning in a different matter, a person seeking to learn the seal for their own uses may add changes to it, suhc as a differing ability or even more stages if they are a more adapt seal user.