I have tested all artifact modification features and all of them add the correct amount to your current value, all of them except Critical severity.
Character critical severity before setting the critical severity
Character critical severity after setting the critical severity (+10%)
Expected result was 106% critical severity.
Obtained result is 103.5% critical severity.
Comments
75% x (1 + 10%) + 21% = 103.5%
Critical Severity: T% (A% + B%)
What is A? What is B?
After you put back the offhand,
what is A? What is B?
https://ibb.co/VgbGr1N
I guess my base just decreases depending on the more buffs I have then.