Ink is an advanced ninjutsu used by Sai and his awesome son. It's a unique style of ninjutsu that uses Chakra enhanced ink along with artistic drawings in order to bring said drawings to life. This ranges from ants of ink to a full blown dragon. From what I've seen in the anime and in the rp, we can have it either pre drawn on scrolls/paper, or even draw the ink onto ourselves in order to use the creations. To be honest, I'm not sure what the strengths or weaknesses are but I'll make some assumptions lol. Ink is either neutral to all elements (being ninjutsu in an advanced form) or weak to all elements since it's just ink. Uhmmm that's it.