According to the wiki ANY flagship level Battleship could possess the Mirror Ring System. Everything that fallows here is taken directly from the wiki<br/><br/><br/>The Mirror-Ring system is considered the absolute defense used by Fleet of Fog vessels. It is capable of protecting a vessel from virtually any attack made against it. However, unlike the Wave-Force armor, which can take constant attacks, the Mirror-Ring system requires some time before it can be used again.<br/>Upon activation, the Mirror-Ring system captures the energy of the attack within two spatial rings. The ship using the system is located within the point where these rings touch each other. Once the energy of the attack is fully absorbed by the rings, the Mirror-Ring system condenses the spatial rings towards a point inside a different dimension. The rings then release the energy in all directions as a powerful shockwave that does not discriminate between allies and enemies. When U-2501 submarine used her Mirror-Ring system, the shockwave broke apart Takao, although she was already battle-damaged.<br/><br/>While Mirror-Ring system is an ultimate defensive mechanism that can turn the enemies' attacks against them, it places significant stress on the user, at least in the case of its use by U-2501. The U-boat appeared to be under the effect of powerful vibrations that may have caused damage to the submarine itself. Additionally, the ship suffered from weakened sensors, placing it at risk from further attacks.<br/><br/>Under normal conditions, only flagship-level battleships and superbattleships could possess a Mirror-Ring system. It was discovered that U-2501 also has one, but it is unknown why that is the case. U-2501's possession of a Mirror-Ring system was considered so secretive that Yamato ordered Takao's memories to be locked to prevent the heavy cruiser from recalling the system's use to subdue her.