1. Choose a core for breakthrough. Once confirmed, it cannot be changed.

2. Each core can undergo up to 8 breakthroughs.

3. A failed breakthrough will reduce the core's level, without the possibility of further breakthrough.

4. A core might not be able to go through more breakthroughs when you have no more attempts, the breakthrough fails or the core is taken out.

5. The success rate of the breakthrough is 55%, with its failure rate being 45%.