Aches are enemies from Zelda II: The Adventure of Link. They are blue bat-like creatures, similar to Keese, and attack by swooping down to claw at Link when he approaches. Aches are masters of disguise and are known as the "eyes of Ganon". They occasionally disguise themselves as normal villagers roaming various towns to attack heroes who might hinder the resurrection of Ganon. Some Aches can also transform into demonic shapes known as Achemen.