Valkyrie Drive - Bhikkhuni bosses are made up of various segments which can be targeted separately. Kongo the Tortoise is no different in this aspect.

For easier fights, you might want to go for her limbs first as crippling those inhibits some of her attacks. Or, as we show in this video, you can try a more challenging route which is to totally disassemble her.

The strategy is simple: At the beginning of the fight, get your targeting widget lock on her center mass (torso). Then just work your way around the boss hitting whatever is in reach (in an intelligent manner). You can see where your blows are landing as there is usually a visual cue to show where your hits are landing.

Avoid targeting the tail as that parts has a lot of HP and generally makes the fight longer and harder. However, if you are attempting to destroy all her cores, you will have to aim for her tail. Her cores will be in the main limb joints and her tail. Check the Internet for specifics for other bosses.

Don't just mash one button. Use combos where possible as it makes the fight much more efficient and is far more fun. Also, it helps you build up your energy faster and you will want those to get into and increase your drive modes and or to heal the initial wave of damage that you most likely will have to bear.

TIP: You can skip the transformation cut-scenes and usually you want to do that as they can upset your combat flow. But they are kind of cool and sometimes, you just need them to let your fingers have a rest ...

https://youtu.be/xHBPWzT3IfI