It does put an interesting spin on healing, especially since I suspect that the next healer job SE comes up with will most likely be more oriented toward dealing damage. It's something I'd definitely go for, but there are three general questions I have with it.

1) You've mentioned how Void Trance will compensate for lacking Cleric Stance, but what is there to compensate for the lack of Protect? That core healer staple means less damage taken, leading to less healing overall required, so how will Occultist counter this dilemma?

2) Given the understanding that this is a healer with a heavier focus on dealing damage compared to other healers, how much damage would you expect this job to put out? Would the typical damage output be at about Machinist and Bard levels, or would it be closer in-line with current White Mage and Scholar DPS?

3) How would this Void Well manifest itself in the game in a way that is still something that allows the player to understand how big it is or whatever percentage it's at? Is it an actual effect separate from the caster? Is it an aura-type buff similar to Darkside? Or would it just be some super-generic buff with a stack number on it?

Story could definitely use some work, but this is overall an impressive approach. Well done!