This formula is not correct yet, as it is missing the flooring. The order of multiplications needs to be investigated for that.

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$$damage = base \cdot (1 - accs) \cdot (1 - type - dr) \cdot \begin{cases} 1.1 & \text{if in Appeal Chance} \\ 1 & \text{otherwise} \end{cases}$$

$base$: Base Note Damage

$accs$: Sum of damage-reducing Accessory effects (Necklaces - don't forget to multiply the effect of a single accessory by 3, because the skill is applied to all three units of the subunit)

$type$: Gd-type bonus/penalty from active Strategy

$dr$: Sum of effects of active Damage Reduction skills

Evaluation of damage seems to be something like: deal damage (cap at 0), add healed stamina if a healer procced, then check for game over. That means if a stamina restore procs when you would have died, you instead continue with the amount of stamina the skill restored.