User blog comment:Crimson Storm Mich/Future Units Preview v2/@comment-27740154-20170129112833/@comment-28149328-20170201032657

To fully understand this mechanic, you'll need to look at the damage formula which is as follows: Damage = [((ATK * ATK Buffs) + (Stat Conversions) - [(Enemy DEF * DEF Buffs) + (Stat Conversions)]/3) * (If Critting, RNG Critical Damage + CritBuffs, else RNG 0.9~1.0) + (RNG Extra Damage)] * ElemMults * MitigationMults * Guarding * Distribution * ExtraHitsMult * SparkMult

Now that sounds ridiculous but the gist of it is: usually, all of the above cannot exceed 99,999 unless you have raise a unit's maximum Atk.