I liked Azrael and Ledah`s ideas, especially those ones about the archive and the arcane researchers and I add a few ideas of my own, even though no one would take me seriously. It`s just my opinion - I am not of Necrovion, nor wishing to be leader, I just shared some ideas.
First of all, the Tainted Warriors should be recruited from the ranks of the Sentinels. You know, pride and glory of the corps, Necrovion. How? Well, once TW has a leader, this guy makes a list of let`s say 3-5 Sentinels and asks the approval of the queen (I understood she`s the one to decide) to promote them within the ranks of the Tainted Warriors. This should be the nucleum of TW (if those 3-5 guys are specialized - a warrior, a clerk, a researcher, a spy - it would be great). This team should work in two directions.
1) to organise TW, prepare a statement, a purpose of meaning, a code of conduct, an organigram
2) to help the Sentinels cope with the loss of manpower, actual and future.
I see the TW not numerous at first. I would like them to be more than a group of brawlers and palookas, that`s too easy.
I believe a warrior isn`t just someone with a sword. It can be also a diplomat, a writer, an artisan, a researcher. They are all fighters in their own field of expertise. TW should be an alliance of enlightened soldiers. If they`re the best of the Sentinels, they can definitely fight. Now, let them specialize themselves in other domains. You`ll have one (or more) archivist, one arcane researcher, one spy, one.. whatever. A thinktank, if you know what I mean.
And if or when their numbers will increase, then and only then should the TW have branches. Shock troops, archivists, whatever you want.