Make Blizzard IV instant. Here's why:

[Nestama]

• A boss disappears, canceling Blizzard IV
• The Black Mage is forced by a raid mechanic to move during a crucial Blizzard IV cast
• The Black Mage is incapacitated by a raid mechanic during or before a Blizzard IV cast
• A boss turns invulnerable just as Blizzard IV lands
• Due to one of the above factors, Astral Ice wears off During a Blizzard IV cast
• Due to one of the above factors, Enochian wears off during a Blizzard IV cast

And to add, the server lag of sorts. If I so much as dare to use Swiftcast for Blizzard IV, I'm going to wait around 3-4 seconds before I can cast it (probably shorter, but that's what it feels like). It's worse when you only have 5 seconds left, are in Umbral, have the MP, but can't cast Blizzard IV yet because reasons.