Special Attacks/Yamato Touch

Yamato gains two different special attacks on Kai Ni/Juu.

The devs distinguish them as:

• For the touch with only Yamato and Musashi:
  • Yamato flagship: "Yamato, leading the attack! Musashi, follow me! 1st Fleet, all guns, full salvo!" (大和、突撃します！武蔵続いてッ！第一戦隊、全主砲、全力斉射ッ！).
  • Musashi flagship: "Oh, Yamato. Forming a battlegroup with you feels so natural. This is what it means to be a battleship" (おう、大和よ、お前とこうして戦隊を組むのは格別だな。これが戦艦だ。).
• For all other touches:
  • "Yamato, leading the attack! 2nd ship, please follow my lead! All guns, full salvo!" (大和、突撃します！二番艦も続いてください！全主砲、斉射ッ！).

However, mechanic-wise it makes more sense to distinguish the touches as 2-ship touch and 3-ship touch:

Yamato 2-Ship Special Attack

"Touch Helpers"

• Yamato Kai Ni/Juu must be the flagship.
  • Secretary for combined fleets.
  • She must not be more than lightly damaged (小破).
• Another "Touch Helper" must be in the 2nd position.
  • She must not be more than lightly damaged (小破).
  • When using Musashi Kai Ni as the helper, Yamato and Musashi positions can be swapped freely.
  • When using Musashi Kai Ni as the helper in the 2nd position with Nagato Kai Ni or Mutsu Kai Ni in the 3rd one being lightly damaged (小破) or better, there is a random chance to trigger the "3-Ship Special Attack" instead.

• There must be 6 or more surface ships in the fleet.
  • There must be no submarine in 6-ship fleets. In 7-ship fleets, only 1 submarine is allowed.
  • There must be no surface ship in the fleet sunk or retreated via FCF
    during sortie causing remaining < 6. Ships in the escort fleet are not affected.

• In single fleet, Echelon needs to be selected.
• In a combined fleet, Cruising Formation 4 needs to be selected.

• The touch can activate even if Yamato Kai Ni Juu is equipped with ASW equipment when facing a fleet mixed with submarines.

If triggered:

• The flagship will do a 1st & 2nd attack,
• The Helper will do a 3rd attack.
• Each attack target a ship at random.

Equipment	Yamato Kai Ni Juu 2nd		Yamato-class Kai Ni 2nd		Other Helpers
	Attacks 1 & 2	Attack 3	Attacks 1 & 2	Attack 3	Attacks 1 & 2	Attack 3
No Bonus Equipment	1.54	1.94	1.54	1.86	1.40	1.55
Surface Radar Only	1.77	2.23	1.77	2.14	1.61	1.78
Sp Very large radar Only	1.96	2.45	1.95	2.35	1.77	1.96
AP Shells Only	2.08	2.62	2.08	2.51	1.89	2.09
AP + Radar	2.39	3.01	2.39	2.89	2.17	2.41
AP + Sp Very large radar	2.63	3.31	2.63	3.18	2.39	2.65

The equipment bonuses do not stack further than 1 radar and/or 1 AP shell per ship.

• Only ships equipped with those equipment will get a bonus for their attack(s).

The attack will consume extra ammo from participating ships when triggered. The total ammo consumption will be x1.6 of the original ammo consumption of those ships when the attack is triggered.

Currently measured above 70%, it seems similar to Big 7 touches:

• Trigger rate is affected by the Level and luck stat of the participating ships.
• Can be triggered even if artillery spotting fails to activate.
• Can only be activated once per sortie.
• Has a chance to trigger every time Yamato takes a turn at shelling.
  • In single fleet, if it fails to trigger in day battle, there is a chance to trigger it in the follow-up night battle.

Yamato 3-Ship Special Attack

• Yamato Kai Ni/Juu must be the flagship.
  • Secretary for combined fleets.
  • She must not be more than lightly damaged (小破).
• A pair of ships from a same "Helper Pair" must be in the 2nd and 3rd positions.
  • They must not be more than lightly damaged (小破).
  • When using Musashi Kai Ni as the helper in the 2nd position with Nagato Kai Ni or Mutsu Kai Ni in the 3rd one:
    • If the 3rd ship is lightly damaged (小破) or better, there is a random chance to trigger the "2-Ship Special Attack" instead.
    • If the 3rd ship is moderately damaged (中破) or worse, the "2-Ship Special Attack" will trigger instead.

• There must be 6 or more surface ships in the fleet.
  • There must be no submarine in 6-ship fleets. In 7-ship fleets, only 1 submarine is allowed.
  • There must be no surface ship in the fleet sunk or retreated via FCF
    during sortie causing remaining < 6. Ships in the escort fleet are not affected.

• In single fleet, Echelon needs to be selected.
• In a combined fleet, Cruising Formation 4 needs to be selected.

"Helper Pairs"
One of the following pairs:
Musashi Kai Ni 2nd ship:	In any order:

If triggered:

• Yamato will do a 1st attack,
• The 2nd ship will do a 2nd attack,
• The 3rd ship will do a 3rd attack.
• Each attack target a ship at random.

Equipment	Musashi Kai Ni (& Helper )		Nagato-class Pair	Ise-class Pair		Other "Helper Pairs"	Any "Helper Pairs"
	Attacks 1	Attacks 2	Attack 1 & 2	Attacks 1	Attacks 2	Attack 1 & 2	Attacks 3
No Bonus Equipment	1.65	1.80	1.65	1.65	1.58	1.50	1.65
Surface Radar Only	1.90	2.07	1.90	1.90	1.80	1.73	1.90
Sp Very large radar Only	2.09	2.28	2.09	2.09	1.99	1.90
AP Shells Only	2.23	2.43	2.23	2.23	2.13	2.03	2.23
AP + Radar	2.56	2.79	2.56	2.56	2.45	2.33	2.56
AP + Sp Very large radar	2.82	3.07	2.82	2.82	2.69	2.56

The equipment bonuses do not stack further than 1 radar and/or 1 AP shell per ship.

• Only ships equipped with those equipment will get a bonus for their attack(s).

The attack will consume extra ammo from participating ships when triggered. The total ammo consumption will be x1.8 of the original ammo consumption of those ships when the attack is triggered.

Currently measured above 70%, it seems similar to Big 7 touches:

• Trigger rate is affected by the Level and luck stat of the participating ships.
• Can be triggered even if artillery spotting fails to activate.
• Can only be activated once per sortie.
• Has a chance to trigger every time Yamato takes a turn at shelling.
  • In single fleet, if it fails to trigger in day battle, there is a chance to trigger it in the follow-up night battle.

Main source: [1]