This is the damage for commanders versus air and sea units. Use this for calculating Ryota's, Ragna's, and Koji's grooves. This is data taken from the game's files. Here's the damage range in text:

Balloon: 55 - 65
Harpy: 90 - 100
Witch: 70 - 80
Dragon: 35 - 45
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Travel Boat: 60 - 70
Turtle: 55 - 65
Harpoon Ship: 45 - 55
Warship: 55 - 65