The first technique essentially allows you to create Shuriken, expect instead of being metallic they're made of Crystal - produced, shaped and moulded by your AE to look like oversized snowflakes that are still capable of piercing and slicing damage. Likely involves projecting Crystal directly from your body, or crystallising the air.
Much like the previous technique, this is another ninja weapon mimicry. Instead of Shurikens the user instead mimics the creation of senbon, utising their AE to materliase needle shaped crystals. These crystals can be shot at the opponent (likely chakra propelled), and can pierce through a range of substances. However, on account of their minature size, they falter when faced with thicker dense substances such as blocks of earth and steel.
Weird technique, essentially allows for the creation of a crystal ball and, following the lore inspired divination abilities that are typically associated with crystal balls, allows the user to monitor the battlefield by staring at the crystal ball in their hands. Strange, but somehow works because chakra? Huh.