We have the account of Eleazaras.
Clearly stating that three Cish walked through a portal into their inner sanctum and proceeded to nuke the joint.
The description of the attackers mentions empty eye sockets (but no snakes around necks)
Also, energy emanating from their foreheads.

So let’s assume it was the Cishaurim.
That would mean Moe was the author of the attack.
Dragging the Spires into the Holy War and providing it, with a powerful enough school to get the job done. 

However, I have heard others state their assumption that the Consult carried out the attack.
That the consult were concerned about a recent development at Shimeh.
Namely the Chishaurims ability (actually its Moe’s Dunyain ability) to discover their skin spies.
And that’s why they were attempting to manipulate Xerius into assisting the Holy War.
If it was the consult, why could Eleazaras see no blemish from sorcery?
Who exactly were these eyeless assassins if not Cishaurim?

So which is it?

And again, why must Serwe hide her sorcery once they are in a certain range. 

I assumed that was for more practical reasons.
Automated Wards in place etc.

Serwe is simply a daughter, and handily able to use the cants of translocation. 

Whow, that’s one bold statement.
 I like it though.

I would guess they will be the main opposition, along with Wracu.
Who else can the Consult field?  (Able to go head to head with the schools)
The Mangaecca are now a bunch of bobbing heads?
The Inchroi consist of two beings.
I’d venture that the Quya who sided with the Consult will be formidable indeed.

It seems I was mistaken about who the custodian of the Heron spear was post Eleneöt.
I’d assumed Seswartha had secreted it away somewhere and kept it safe.
That’s why I found it surprising that he was not the person to use the weapon at Mengedda.
But according to the Wiki Anaxophus V was the custodian, and he was the one who kept it secret until its use.
http://princeofnothing.wikia.com/wiki/Anaxophus_V
Therefore it was only right that he should use it.

Hi Galbrod, I’m not suggesting it was manufactured with chorea.
Rather they were added at a later date.
Imbued was the wrong word to use?

For me Seswatha’s return will be through Akka.
He is experiencing more from the dreams than any other Mandati has ever has.
Maybe Maggot will turn out to be Nau-Cayûti