Datamined source only
The values on this page are extracted from datamined game data in
DT_MonsterStaticData_Overseas.json.
For the follow-up calculations, the page applies the sequential base resist of 7500, which is treated here as 34.71%.
To estimate the required damage, account for resistance ignore, the boss being invulnerable for the first 3 seconds, one or two shields that reduce damage by 50%, and a 1–3% difference from cactus testing.
With 50% resistance ignore, the resulting value is the estimated damage required.