Hrm.. Well, you can do without the Blood Cauldron. It is simply pretty useful to have (and a nice centerpice). Avatar on its own is... funky. Until turn 3 (the third blood rite), you need to spend a prayer to animated it. If this fails, it won't do anything. He is still a good beatstick otherwise.

For the winged ladies it might be interesting to build 10 or so as the melee variant. Those can be quite cool if you charge them and put Mindrazor on them. They can be damage 3 if they have more bravery than their foe.