Frostbite - A heavy chill surrounds the area Ymir is fighting in, only increasing in strength as he becomes more damaged, his very essence becoming a part of the attack. It numbs (or, slows if that makes more sense) the enemies senses, making them a little less fast, a little less strong, and his attacks begin to hurt them more.
Ice Wall - Ymir summons a wall of ice out of the ground, blocking the enemy off from him or trapping them in, allowing for a greater setup of an attack.
Glacial Strike - Ymir smashes his club against the ground, freezing it over. This will force enemies to tread carefully where he moves freely, which makes up for his slower movement.
Frost Breath - Ymir uses his breath to freeze parts of his enemies, such as their legs, arms, torso...groin...in order to slow them down or hurt them.
Shards of Ice - Ymir begins to freeze the air in a 35 ft radius around him, causing shards of ice to grow on his back. These eventually explode out of him, like a nail bomb.