Koori Ryu is a powerful dragon upgradeable via tokens purchased in the Onyx Market and earned during Alliance Events. Along with his brother, Koori Koma, they make for a formidable duo, especially when upgraded to level 6.
Koori Ryu does damage in a surprisingly small area, making him less effective than other dragons who typically have a splash radius of 3.2 and are able to hit 3x3 buildings next to each other separated by walls. He is only able to hit one 5x5 building at a time, and lower levels are able to hit even less. The freeze effect of his breath is fairly destructive, and slows attacks down to a crawl. Most buildings will appear completely frozen until they die from the massive damage.