A few questions from a new Scholar

[JonFarron]

Sustain.

EXTREMELY useful. I use this at least once or twice a boss fight. Your fairy prioritizes herself last, so if people are taking constant damage, she probably won't ever get around to healing herself outside of using whispering dawn. It has such a short cast time, you just stop for a sec, cast, and continue moving. Almost like an instant cast, lol. I also use it if a tank derps and faces the boss/mobs toward the fairy and she gets smacked by an AoE. Boss attacks DO hurt the fairy quite a bit. Coil bosses can actually one shot her. (Stone-skinning your fairy is also a good idea for damage prevention before encounters). I've also had her pull aggro with a whispering dawn right off the bat in boss fights. Fun, lol.

Miasma II.

Use it during dungeons on mobs after you bane them, then Blizzard II spam.

On a single target mob, it's a DPS loss. Bio>Ruin II>Misama II on single target. Don't ever use Miasma II on single target.

[Hulan]

On a single target mob, it's a DPS loss. Bio>Ruin II>Misama II on single target. Don't ever use Miasma II on single target.

I'm actually going to respectfully disagree with this, though the difference is academic.

If you are comparing what a SCH can do in a single GCD window, Miasma II is statistically slightly better than, say, Ruin II (SCH's best single target ability once normal DoT rotation is done [I'm incorporating secondary effects, like the fact that it is instant cast]). Miasma II is 170 Potency over it's duration, which is quite short, close to guaranteeing it will get its full effectiveness. Now, this is all assuming you actually have the time to put up Miasma II, which is not always the case. It should, of course, be your last priority, far below healing, buffs, other DoTs, maintaining your fairy.... But technically it's better than throwing out a Ruin/Ruin II.

[JonFarron]

Stuff about Miasma II

While this is true, I still prefer Ruin II over Miasma II because of the Blind effect possibly reducing some damage. Of course the other DoTs should be cast before either Ruin II or Miasma II is even considered. However, in terms of Instant cast spells, Bio is always the best option for damage when you find an opening to cast an attack. (Unless you don't have to move, where Bio II is the best option)

[Hulan]

While this is true, I still prefer Ruin II over Miasma II because of the Blind effect possibly reducing some damage. Of course the other DoTs should be cast before either Ruin II or Miasma II is even considered. However, in terms of Instant cast spells, Bio is always the best option for damage when you find an opening to cast an attack. (Unless you don't have to move, where Bio II is the best option)

Yeah, and as I said, it's academic. The difference between Miasma II and a single Ruin II is going to be 100~200 damage in even the best gear, if my napkin math is correct. In the grand scheme of things, if you are to the point where you even have the chance to use Miasma II or Ruin II, you are doing quite well for yourself.