A single column of water chakra or water wrapped in the user's chakra, attached to one hand. When actually water, the Mizuhakeru bloodline can drain through this column and the bodies of water contacting it (picture a straw lifting water out of a greater body). The column can be thickened for greater force (up to something like a straight-up ball of water/chakra, which could also be called a Water Fist or something) or lengthened for greater reach. It can wrap around things and hold its shape around them, and be contracted (and pulled) to pull the object in its grip closer to the user. It maintains its columnar shape on impact, putting the full force of the water chakra or water's mass behind the blow.