I've been testing the Lich set (recently got enough pieces to get the 5 piece bonus).
Thus far, my findings indicate that it doesn't work at all. I got up to 4100 and 4900 regen during different tests. The duration of the buff is 20 sec. I should have gotten a full magicka bar back once the buff ran out, but I was about halfway short
Furthermore, I tracked the regen ticks using Advanced UI addon. At 2400 magicka regen, it showed 1700 ticks. At 1900 regen (according to the thingy that comes up when you press 'c'), it showed 1600 ticks. At 3200 regen, it showed 2500 ticks. I eyeballed the numbers on the blue bar and, after waiting for it to get to a ,000 number or close so I could easily guess, these tick readings were shown to be correct.
The 3200 regen was achieved through drinks. From this, I can assume that not only is the Lich 5 piece set not working, but the magicka regen bonus from Orzorga's Red Frothgar isn't either.
Mind, all of these tests were also done using the default UI and eyeballed as best I possibly could (as well as LUI extended, which just shows lovely numbers). It all checks out.
If this could be fixed ASAP, that'd be lovely.
Thanks for reading.