Question- how exactly does Strickening create weaknesses (I know it must be brought below zero)? Can it only make weaknesses with *elemental* resistances or does it work with combat resistance as well? Thanks in advance =)
Basically the general resistance that you see when you pull up a monster stat box shows their resistance vs. all types of magical damage. If you're doing multiple types of magical damage they all get rolled (soaked) against this separately.
Then there are specific resists such as "Resists Fire." That creates an extra soak roll when Fire damage is done. So if somebody resists something specific that damage is getting soaked twice.
Now if they are weak verse a particular element and/or Holy then the damage caused by that element is actually increased by their specific weakness before it is soaked against their general resistance.
So at higher levels of Holy Strickening Fyona is reducing general resistance and she is also decreasing elemental resistance which in most cases actually creates weaknesses because the monster has no specific resistance vs. various elements or Holy.
Say the spell cast in the OP is cast on an Ice Troll that has 22 general resistance and 6 resistance of Lightening and Ice each. After the spell is cast he will have a 10 general resistance and 4 resistance of Lightening and Ice. He will also be weak verse all other elements and Holy by 2. So say Karjtan pounds him with a firebolt for 56 damage of which 36 is base damage and 20 is actual fire damage. The fire damage is actually increased by 2 because of weakness vs fire created by Fyona's Strickening. So then 22 fire damage is rolled against the Trolls now general resistance of 10.
If Lightening damage were done it would be soaked first against the specific resistance (4) and then the general resistance (10).
A final note. You only get the bonus of weakness vs. up to the amount of damage you've actually done. So if if somebody has a weakness vs. Holy of 12 but you only do 8 Holy damage it's only going to add on an extra 8 damage not the full 12. But hey, you've still doubled your Holy damage.