I have got my Shadow Priest fight class to switch into Voidform, which was kind of a pain. But now it refuses to cast Void Bolt. I have tried by name and spell ID, but Void Bolt replaces Void Eruption when you go into Void Form.

Void Bolt (Id found: 228266, Name found: Void Bolt, NameInGame found: Void Bolt, Know = True, IsSpellUsable = True)

I have tried using the spell ID for Void Eruption and Void Bolt. And the names of both. But nothing seems to want to cast Void Bolt. 

Hello, try to use lua

To solve this issue, I used

CastSpellByID(228260) with the condition of Insanity > 70 to cast Void Eruption and enter Voidform. From there I used 

CastSpellByID(228260) to cast Void Bolt. When in Voidform, the spell ID for Void Bolt is the same as the spell ID for Void Eruption when you are not in Voidform. Added in buff check condition to ensure I was in Voidform to cast this, and another checking the duration of the cooldown for Voidbolt (or else it chain casts when it's on cooldown and won't go down the list).