Since there isn't any DR on crit chance you can just calculate dps. part of dps that uses surprise attackdps * 0.1 add part of dps that doesn't use surprise attack+ ((dps * 0.9) divide by crit layer stuff/ ((1 - CritChance) * ( 1 + OffenseBonus + DamageMod) + CritChance * ( 1 + OffenseBonus + DamageMod + Severity)))…
In any case, the average effect of Surprise Attack is a 1/2% crit increase over the full fight duration, unless the various margin cases (not applying to the first hit, applying for up to 6s after target drops below 90%) are important, or the target spends a disproportionate amount of time at some particular level of…
Like you said, it depends on the context of the fight. Is the target's HP going down in even increments of 10% or less per increment? If it's a mob, well SA is awesome... because you can make it work such that a crit = one shot. If it's a cosmic, depends on the run. For example, at Kiga the first 70% of hp might be easy /…