Runuganga

Lunuganga (ルヌガンガ, Runuganga, Seiyu: Taketora) is a giant Hollow made of sand whose head resembles a sand castle. He is the Guardian of the White Sands, and acts under orders from Las Noches. Being made of sand, he's immune to physical attacks, simply regenerating from any wound. He can control the sand around him to attack, creating sinkholes and tornadoes. Being made of sand, however, makes him weak against water, and he is easily dispatched by Rukia Kuchiki as a result. In the anime, Lunuganga is able to create copies of himself through sand, and therefore, while easily dispatched, killing his individual bodies does not kill him as a whole.