With Fire IV coming along...what happens to Flare?

[Sleigh]

Don't forget that Fire IV (and Blizzard IV for that matters) do not refresh astral/Umbral stacks. In short, you may use only one, 2 max every stack refresh.

Not quite. With Leylines/Selene you can do 3 F4s in a row into F1, or if you have a Firestarter ready, or if you are at the end of your rotation and as long as you are in AH3 when you press B3 it has the effect you want.

[Kuwagami]

Not quite. With Leylines/Selene you can do 3 F4s in a row into F1, or if you have a Firestarter ready, or if you are at the end of your rotation and as long as you are in AH3 when you press B3 it has the effect you want.

Oh yeah I was considering a "normal" situation, like F3 => Eno => F4 off the bat. F1 will not disappear magically because F4 appears.
Also, MP costs might enter in consideration in the theorycrafting to determine if it's worth to throw more than a couple F4 in the rotation or not. You don't want to end a few MPs short for B3, do you ?

[Menae]

Oh yeah I was considering a "normal" situation, like F3 => Eno => F4 off the bat. F1 will not disappear magically because F4 appears.
Also, MP costs might enter in consideration in the theorycrafting to determine if it's worth to throw more than a couple F4 in the rotation or not. You don't want to end a few MPs short for B3, do you ?

Fire IV costs less than Fire I (but not a lot less), so you can a Sharpcast F1>F4>F4>F3>F4>F4>B3>B4. If Sharpcast isn't up and you don't get a Firestarter from the F1, replace the F3 with another F1 and drop the last F4. MP likely won't be an issue.