Dry Ice Technique

By focusing her chakra to freeze/solidify carbon dioxide in the air to create dry ice. After that she is able to use the dry ice for various techniques, with the additional effect of the dry ice. By remembering the chakra signature of allies, she's able to negate the dry ice effect for them. Thus negating constant worry of terrible harm to them. This signature technique of Ayane is what made her such a respected ninja in Konoha.