The Cryonis Rune is an item from The Legend of Zelda: Breath of the Wild. It is a Rune ability for Link's Sheikah Slate unlocked in Keh Namut Shrine. It can be used to create large ice pillars that Link can climb. Other than climbing on top of the ice pillars, they can also be used as blocks to force open closed doors, stop doors that open and close rapidly, or shield against enemy attacks. Ice pillars can be created vertically from the ground or horizontally on waterfalls. Up to three pillars can be active at once; if Link creates a fourth pillar while three pillars are already active, the first pillar (by chronological order of creation) will disappear. While Cryonis is active, Link can also manually destroy an active pillar.