Meaning of "reduces the cost of ... your ... abilities" by X%?

FrancisCrawford · May 2020

What is the currrent meaning of passive skills or set bonuses that "reduce(s) the cost of all your abilities by 3/6%" or "reduce(s) the cost of your magicka agilities by 7/10%" or whatever?

Do they really cut the costs of everything -- skills, sprint/block/bash/roll, etc.? For example, does Armor of the Seducer cut the cost of ice-staff blocking?

olsborg · May 2020

Reduce cost of your stamina abilities work for active skills such as skills, dodge and break free. Not block. I assume it works the same way for magicka reduce cost. It wont work for blocking with ice staff.

FrancisCrawford · May 2020

olsborg wrote: »

Reduce cost of your stamina abilities work for active skills such as skills, dodge and break free. Not block. I assume it works the same way for magicka reduce cost. It wont work for blocking with ice staff.

This thread seemed to conclude that Red Diamond, Battlefield Acrobat, Alteration Master do affect block cost. Was that actually true then? Is it true now?

https://forums.elderscrollsonline.com/en/discussion/471234/imperial-red-diamond-passive