But don't worry, the admin and editor team are aware of them and they will be resolved over the next few days as our Weapons Module goes through a much needed overhaul. Sorry for any inconvenience!
– FINNER (talk), 05:04, 20 January 2022 (UTC)
Serration damage is applied before any other damage type. Therefore, every other damage increasing mod benefits from Serration. E.g. a weapon with a base damage of 18 equipped with a rank 9 Serration mod (150%) would have a new base damage of 45: 18 × (1 + 1.5) = 45
This new base damage will be what is used to calculate elemental damages.