@Lamoron: I do believe he was joking in the UA comment in that he meant one of two things:
1. The lack of a UA to give Bane Knights more Utility.
2. The 'real' UA that is Tartarus.
@Scottl1: I am a believer that Banes are very fine without Tartarus. In addition, I did chuckle at your addressing him as the UA, but it comes back to their 'role'...they are not there for true muscle, they are there to be Terrain Ignoring, Tough, Weaponmasters, with Vengeance that that the opponent can't ignore.
Certainly Tart would be nice in the list, but it would break the "30 Bane Knights LOL" theme
The Deathripper is for Turn 1-2, or Endgame turn arcing. Annihilation 'does' have a use early game, esp. vs. magical light enemy armies. In addition, it leaves having the option for sneaking in a spell assassination (via hellfire) when/if Terminus was gorged on souls the previous turn... as he's not as 'offensive' in the list and in the way I play him.