1. When you cast Frenzied Regen a separate buff called Mass Regeneration is applied to the raid, correct?
Yes, spell ID here :Mass Regeneration - Spell - World of Warcraft2. If you then swap to cat form do you get a Mass Regen buff on yourself or do you lose all benefits?
You lose all benefits, the raid continues to have the benefits. They won't get healing, but still get the increased healing taken.3. Are there any notable limitations to how the buff is applied, such as range, different phases, etc.?
The spell data from above indicates range to be 100y.4. What happens if you cast Frenzied Regen while you still have the debuff from shifting into bear form?
You get the normal effects as if you did not have the 4pc.5. The current consensus seems to be that the health buff applied to raid members is 15% of the bear's max hp, is this accurate?
Yes, regardless of buffs on yourself or raid member it takes a snapshot of your health increase at cast and gives half of that to the raid.
Char After Before Increase
Xeno 257936 198413 59523
1 170410 140649 29761
2 178822 149061 29761
3 232926 203165 29761
4 178914 149153 29761
5 163340 133579 29761
6 175938 146177 29761
7 167426 137665 29761
8 173292 143531 29761
9 163823 134062 29761
10 167372 137611 29761
11 165440 135679 29761
12 173054 143293 29761
13 171388 141627 29761
6. Additionally, temporary health buffs such as Power Word: Fortitude and Rallying Cry increase the Mass Regen health buff, correct?
Yes, they increased both the health given and the healing done by mass regeneration ticks in proportion with the tanks increased health.7. What happens if temporary health buffs are gained or lost after Mass Regen has been applied, on either the bear or the other raid members?
Losing a health buff mid regen (I click off my mark of the wild) reduced healing tics to their new expected value. It did not reduce the health bonus.8. If Frenzied Regen is glyphed then raid members gain 15% healing taken with Mass Regen, correct?
It still gives a 30% increase to healing received.
Testing with a priest using desperate prayer, which heals for a set 30% of current max health (+6% and +12% from other priest talents)
Before, 142k, healed for 50.57k
After, 177k healed for 82.0k (That is 63.04 from new max health + 30% healing bonus for mass regen)9. If Frenzied Regen is not glyphed then raid members are healed for 1.5% of the bear's max hp every second, correct?
After the nerf, it is now 0.75% of the bears max health a second, if 10 rage is consumed (0.075% per rage consumed). As seen 2 posts previous.10. Does this healing depend on whether or not the bear who used Frenzied Regen has rage?
Yes, directly proportional to rage consumed.11. Does this healing continue to work if the bear changes form, dies, enters a different phase, etc.?
Dieing or changing form stops any healing you may have been giving, but does not effect the increased health or healing taken buffs on the raid. I have not yet had a chance to test on Ultraxion with phasing. 12. This healing can crit and also benefits from talents and abilities that increase healing taken, correct?
Yes. Whether or not it crits on you is independent from if it crits on other people, crits on you do not heal them for more. Crit rate on 1500 ticks was ~16, near to my raid buffed spell crit.
Thursday - WOL example showing crits and a warlock (Demon armor) and a feral cat (Nurturing Instinct) taking more healing.