So I was messing around with some of my underused and new commanders (mostly backer units) and made this kinda-meme-but-not-really division while filtering by Night type.
Naga / Maya Tree
Awakened Karvia
Shinra
[L] Courtesan Sylvia
Onmyoji / Naberius
Mini Mad-Scientist (Elea)
The division has a total of M-Dark Shell 7, M-Poison Shell 6, M-Dark Field 10, M-Poison Field 5, and Poison Field 37. With Amplification 65, the base damage of Shell skills comes out to about 21.45% HP (11.55% Poison), and the base damage of the Fields adds up to 85.8% HP (69.3% Poison) on the opposing division and 24.75% HP (8.25% Poison) to other divisions.
*Fields and Shells don't really "add up their damage" due to differences in base HP, but you can estimate their impact due to said base HP being within a range with proportional growth per level (see below). Against equivalent LV units, straight percentages make for pretty good estimates of actual damage.
Besides that, the division has Cross+All Null, Amplification 65, Command Night 35, Night Boost 30, and Squad Boost 15. Elea has abysmal Defense, so she's the decoy by default. She can get Target Miss from R8 Elven Bow to pass aggro to Naga. Maya Tree comes with the amazing Counter Ailment + Vampiric Attack combo and Equitable Heal, but gives up Cross Null, Slayer Defense, and Recovery. Naberius has Pierce Null, and you can get Wide Null via equipment to replace Cross Null.
By the way, I haven't found the stat growth formulas yet, but I have found that HP grows the same as in VBF.
HP = baseHP + baseHP * (LV - 1) / 4
In other words, HP grows by 1/4 of its base value per level. Since Alteration changes base HP, it will also boost HP growth. I assume this means stat growth in general follows a similar formula to VBF's, if not the exact same. I checked the estimated formula and it's no longer accurate, so the experience curve might have changed.