Part 2: mastery
The Draenor mastery ability was removed & replaced with a new mastery for Legion.
This new mastery increases your healing done by ALL spells for each HOT on your target (e.g., rejuv, lifebloom, wild growth, regrowth’s HOT portion). So, having 2 HOTs on the target will heal more than 1 HOT on the target. Then, 3 HOTs heal for more than 2 HOTs, and so forth.
Additional HOTs from talents can also increase this mastery healing (e.g., cultivation, spring blossoms, germination). Note that effects like living seed, efflorescence, and tranquility don’t count towards the mastery, as they are not considered HOT effects. Cenarion ward only counts as a HOT after the person takes damage (e.g., the ward is consumed) and the HOT portion is ticking down for 8 seconds.
All HOTs benefit from the mastery (e.g., if you cast Rejuv on someone who has no other HOTs, Rejuv still gets a mastery bonus value of 1 HOT). The mastery buffs both your direct heals and HOTs, and the bonus increases for each HOT you have on a target (e.g., the 5th HOT still increases more than the 4th HOT). Although you won’t often have more than ~3 HOTs on the same person in a typical encounter, the max theoretically possible you could happen to stack on one person is around 8 (depending on talent choices).
How does this impact your healing?
- While the old mastery buffed you (the healer), the new mastery is based on number of HOTs on each individual target (e.g., if you have 3 HOTs on your tank and 1 HOT on a mage, then the mastery bonus is higher on your tank than the mage).
- Druids are balanced around ~1 to 2 HOTs on a target for the purpose of raid healing. So, in most cases, the main goal will be to avoid casting Healing Touch or Swiftmend on people who don’t have HOTs on them. The larger the group size, however, the less likely you are to be able to stack HOTs.
- In general, your goal should be keeping multiple HOTs on the tank and not worrying too much about the mastery for raid healing (as shown above, the increase in rejuv ticks at 100 don’t make a second HOT necessary for rejuv to be beneficial for your raid). Try not to spam yourself OOM by blanketing people needlessly just because you think you have to HOT stack.
- HOTs dynamically update every time they tick. It doesn’t matter what order you cast your HOT spells in when stacking multiple HOTs on a target. Your mastery will check number of HOTs on a target every time it ticks. So, it doesn’t matter what order you cast your HOTs on the target.