Falling Sky.

Chaos itself doesn't have any weaknesses because it is always changing. Its strength comes from the fact that it tries to force other systems to change too.

Those systems that go along with the forced change eventually break because the corruption of entropy increases the amount of unusable energy within a system or possessed by an entity, and it also increases the randomness in the system. 

Unless a system has infinite capacity, it will eventually fall apart as entropy occupies too much of it. Even the universe will fall apart in due time as entropy increases. It will take time, but it will happen. The same thing will happen to this seal. He just needs to be patient.

The seal flickered as soon as Chaos energy touched it. All the threads defended the seal against the attack at the same time. They appeared like lines of different colors on the barrier. They were pulsating and shifting to defend the attack.