**You will need to visit Node J 2 more times and score an S rank twice and complete the quest.
**You will need to visit Node J 2 more times and score an S rank twice and complete the quest.
**Once completed the [[Abyssal Twin Princesses]] will be weakened for the final kill.
**Once completed the [[Abyssal Twin Princesses]] will be weakened for the final kill.
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*'''SS(V) Levelling'''
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**The first node of the transport phase (Node C) is an air battle node that gives the flagship between 350 to 450 exp per run with every S-Rank. Since submarines automatically complete air battle nodes without taking any damage, this is an easy way for them to gain experience. Send a single SS(V) to that node and then retreat immediately after the battle animations and results screen. The morale loss should be negligible as the flagship will always attain MVP status, and the amount of fuel / ammo used is also very low.
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*'''Power leveling note'''
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**There is a way to power level your submarines on the first node on E3. Node C is an air node and it gives the flagship between 350 to 450 exp per run. You can use this to power level your Maruyus to level 20. It costs only 1 fuel and 1 ammo per run and make sure you retreat after that node.