Fused armor destroyed: what happens?

[123456789blaaa]

At 8th level, a bone knights bonecraft armor fuses to their body. What happens when this armor is sundered or disintegrated?

[Skevvix]

SRD says that you can only sunder a shield or weapon.  the last line of the entry specifically calls out not being able to sunder armour.

And as for the disintegrate, it either effects a creature or an object. 

Creature is reduced to 0 or less it gets powderized, it's equipment is unaffected. 

Is the armour now part of you or still considered an object?

Objects get disintegrated in a 10ft cube of non-living matter. 
Non-living matter means you would be fine if they targeted your armour.

Would disintegrating it count as removing it, thus killing you?

I think I would go with, if it targeted you, it would be fine.  If it was the target, and failed it's save then you both die.

[Garryl]

Armor can still be damaged and destroyed through certain specifically targeted spells and effects and through failing a saving throw on a natural 1. Bone Knight doesn't do anything to change that, does it?

[Arz]

No. If you have the exoskeleton level and this happens, the character dies, no save.

[linklord231]

Having the armor destroyed isn't necessarily the same as having it removed though.

[NunoM]

I think the big question is: is the fused armor still separate from the character? or not?

I'm a bit on a limb here, seeing good arguments on both sides of the question.

IMO, the armor can't be removed, but isn't exactly a part of the character like an arm or a leg, so i would say it's a separate entity. That being said, if destroyed, i wouldn't count it as "removed" for purposes of killing the character. A bit like breaking a tortoise's shell doesn't necessarily kill the animal (but would definitelly hurt and the poor animal would eventually die, so don't do it!)
It could be replaced and regain it's lost abilities.