o get string art you must reach level 5 and do the 'blood test' after that you will be awarded a random art. there are no chance that I'm aware of right now.
first skill, string claw: the user slashes the air making 3 strings appear.
second skill, string pull: the user makes a string pulling the opponent.
third skill, thread cage: you aim your mouse at somebody causing a cage to appear around them closing in on them damaging them.
fourth skill, cutting thread rotation: the user generates a big web of string shooting it at the opponent.