Making a bizarre boss

[Diachronos]

At the moment I have the party in one of my games running through a "maze" of sorts (really just a set of rooms connected by portals with each portal taking them to one of the 8 other rooms at random), with each room having a specific theme.

The room I'm working on right now is a hive, after looking over options for hive-themed creatures to put inside I decided that a Worm That Walks would make a suitable "boss" for the room. But then I stumbled across something I'd missed in the Worm That Walks template: The template can be applied to any creature as long as it's an evil spellcaster. So the gears start turning, and I realize... What else is absurdly evil and associated with hives and swarms?

Vescavors!

So now I've got a Vescavor Queen Worm That Walks in the room, with her spellcasting coming from 10 warpriest levels (for the Control Madness greater blessing). She's going to be accompanied by 4 vescavor swarms (debating giving them the Advanced template).

For the most part she's done, but I'm having a hard time choosing feats and equipment. At the moment I've tweaked her default feats to give her Power Attack, Dodge, Hover, Flyby Attack, Imp. Natural Attack (slam), and Toughness, and she's getting Weapon Focus (slam) and Diehard from Worm That Walks and her first Warpriest level. No other feats at the moment.

Rather than giving her standard equipment, I was considering giving her a unique item that would:
* Give her +9 natural armor to cover what she lost from the Worm That Walks template
* Allow her controlled swarms to share her fast healing and ability DCs rather than using their own
* Remain equipped on her if she were to discorporate
* Allow her racial HD to stack with her warpriest level for the purposes of calculating her fervor, blessings, sacred armor, and sacred weapon abilities. So 7d6 fervor 13/day, +5 sacred armor, +5 3d8 sacred weapon, and a +10 bonus from her minor Destruction blessing instead of +5
* Maybe function as a conductive amulet of mighty fists?

Any tips or pointers on building this creature?

[deuxhero]

You're the GM and it's a combat chassis with high HD so grab the Martial Training feats to pick up Eternal Guardian. The swarms also take Martial Training but use it to get Shattered Mirror. Have some Fun with the curse mechanics.

[Diachronos]

I'd rather not use 3rd party stuff, since that's a restriction I placed on the players as well.