General

[quote=spitfirebal2]Terminus fan is faster than Fafnir Indigo Flash and SW Wind but has less magic attack, so you would ideally want one of those for Haku instead of Terminus Summoner.

Kanna's main attacking skill is probably Vanquisher's Charm, which is a hurricane-like attack and doesn't factor in fan speed, so for heavy bossing, you would still want a SW Wind or a Fafnir Indigo Flash. However, the following things are affected by your attack speed:

Lightning Shikigami Haunting (For hitting Gollux's eyes)
Teleport speed
Casting speed of all skills that are not Vanquisher's Charm.[/quote]

Fan speed also affects Casting Speed of Vanquisher's Charm too. It affects the start up and the delay after ending the cast.

Terminus fan is faster than Fafnir Indigo Flash and SW Wind but has less magic attack, so you would ideally want one of those for Haku instead of Terminus Summoner.

Kanna's main attacking skill is probably Vanquisher's Charm, which is a hurricane-like attack and doesn't factor in fan speed, so for heavy bossing, you would still want a SW Wind or a Fafnir Indigo Flash. However, the following things are affected by your attack speed:

Lightning Shikigami Haunting (For hitting Gollux's eyes)
Teleport speed
Casting speed of all skills that are not Vanquisher's Charm.

Use it for haku and get an Indigo Flash as your main weapon whenever you can afford it.

id honestly just get an empress fan tbh.