This would be used for low level PvP. Obviously, you'll have to end up retrieving all of these things which might make this a bit more difficult than expected.
Dark Orb requires Cast Light to retrieve.
Dark Bead requires you to get to just about the end of the DLC. You have to kill Chester for his armor. You have to farm Bloated Sorcerers for the catalyst as well as the headpiece.
If you're really into doing low level builds, this is for you.
Covenant is Darkwraith because of course you're going to want to PvP with this after all the trouble you go through.
RTSR and the Crown of Dusk is highly recommended prior to PvP.
