Conceptual help with a Fortunata/Widow
Far from beating down canon, that is the actual canon of how Arachnos Banes operate -- as a single hive-mind unit. I'm not sure but I believe Widows operate similarly (or at least, I don't believe there's any canon that would directly contradict this).
As far as breaking free, you could say that she had an usually strong strength of will that enabled her to break free, or even tie it into the villain-side morality arc involving the "freedom virus" spreading through the Bane collective. Westin Phipps also has an arc about this.
"You don't lose levels. You don't have equipment to wear out, repair, or lose, or that anyone can steal from you. About the only thing lighter than debt they could do is have an NPC walk by, point and laugh before you can go to the hospital or base." -Memphis_Bill
We will honor the past, and fight to the last, it will be a good way to die...
Neat. So it's not really a matter of making it fit canon, it's what threads of canon to tie it too.
To answer the second question, it's entirely possible to have a Fort with nothing but psi blasts and a Widow with nothing but claw attacks.
As for the first... it's a very neat concept! As Darkgob noted, non-player Banes basically work in this manner, and it's no stretch to imagine a powerful psychic replicating the phenomenon. Add the fact that Widows get the Mind Link power (which essentially does what your character does, on a smaller, non-permanent scale, per the power's description) and it all makes perfect sense.
I'm thinking of finally dipping a toe into the EAT pool and making a Widow on Virtue, but I'm not really sure where to start. I wanted to know several things before I rolled her up, though:
1. The concept of the character is for the widow to be bee-themed, a widow with psionic powers that give her a strong mental presence in other's minds, making them want to obey her commands. Her power steadily overtook everyone in her base, giving them a sort of linked hive-mind with her at the center. Enamored with her own abilities, she decides to break free of just being a standard Arachnos soldier and become a Destined One. Does this beat-down canon in any exceptionally eye-rolling way, or would you RP with this character without your suspension of disbelief being strained?
2. I was thinking of trying to use Dual builds to give this character a 'Queen Bee' and a 'Soldier Bee' build, Fortunata and Night Widow respectively, with the Fortunata being all psychic power and the Night widow being all claws. Is it possible to do this, or is it difficult to slot/play?