Changes

*There's a gold submarine in the boss node. A possible tactic is to bring 1 CL flag with heavy ASW gear and 5 DD, enter battle in Line Abreast formation to deal with it quickly and get less damage from enemy ships, to focus on night battle. This fleet composition is the most resource efficient and can often succeed. Try double line or echelon on pre-boss nodes to better absorb enemy cut-in attacks.

*There's a gold submarine in the boss node. A possible tactic is to bring 1 CL flag with heavy ASW gear and 5 DD, enter battle in Line Abreast formation to deal with it quickly and get less damage from enemy ships, to focus on night battle. This fleet composition is the most resource efficient and can often succeed. Try double line or echelon on pre-boss nodes to better absorb enemy cut-in attacks.

*Another possible strategy is to run 2 Fast Battleships, 2 CA(V) and 2 DD. This has a high chance of reaching the boss node and can get a lucky kill on the Wa-Class, but is extremely expensive in fuel, steel and ammo.  Make sure not to equip bomber seaplanes so that your ships do not target the SS.  A variation of this is to replace 1-2 CA(V) with CLT, but 2 CA(V) should be used for the final form because of the changes in boss composition.

*Another possible strategy is to run 2 Fast Battleships, 2 CA(V) and 2 DD. This has a high chance of reaching the boss node and can get a lucky kill on the Wa-Class, but is extremely expensive in fuel, steel and ammo.  Make sure not to equip bomber seaplanes so that your ships do not target the SS.  A variation of this is to replace 1-2 CA(V) with CLT, but 2 CA(V) should be used for the final form because of the changes in boss composition.

*A possible strategy is to run 3 CLTs, 1CA(V), and 2 DDs. This is the most efficient with highest Attack power/torpedo and possible to lowest encounter rate (C-D-I-K)

*A possible strategy is to run 3 CLTs, 1CA(V), and 2 DDs. This is the most efficient, with highest Attack power/torpedo and possibly the lowest encounter rate (C-D-I-K)

*[[Akitsumaru]] can do air superiority at boss node with at least 2 [[Reppuu (Strong Gale)|Reppu]] + [[Type 52 Zero Fighter]] or 3 [[Shiden Kai 2]] so your fleet can perform artillery spotting and prevent enemy ship do artillery spotting to you. Keep in mind that she is '''slow ship''' so you will suffer at submarine node instead.

*[[Akitsumaru]] can do air superiority at boss node with at least 2 [[Reppuu (Strong Gale)|Reppu]] + [[Type 52 Zero Fighter]] or 3 [[Shiden Kai 2]] so your fleet can perform artillery spotting and prevent enemy ship do artillery spotting to you. Keep in mind that she is '''slow ship''' so you will suffer at submarine node instead.

*'''Both enemy and ally submarines do not have increased evasion during battles STARTING at night, i.e. hitting them is as easy as in any day battle'''.

*'''Both enemy and ally submarines do not have increased evasion during battles STARTING at night, i.e. hitting them is as easy as in any day battle'''.