Yeah i had this idea aswell about āOmega Celestial Bossesā kinda somehow a while back while checking out this mod ā Helliquary Source released ā this would be a perfect place to bring something like this out, maybe even with an Empowered Callagadra There surely has to be done SOMETHING at some point with the all this given content around the Omega Faction, what came to my mind was you can fight such an UBER ONB in this arena room, or even better, use that mod as a HUBZONE, maybe called Omega Sanctuary, which has some portals that will lead to special rooms where you can fight different UBERS where you need some KEYS for, gathered by the normal ONBs so many ideas with this, but at this point there is soo much to do, that i can not tell you when the time comes for this tryhard act (already tried it in one night to integrate that amazing mod, its a mapmod, not so easy, as it will cause many issues that i couldāt solve in a short time and i do not like to work that much with the map editor, cause it is very very clonky :D, but we will see what the time brings).
About the shattered affixes, yes i think i should not add too many more, absolutly correct, would drain the chance to an absurd chance to get what we want, even was thinking more about making a second NPC when it will come to shatter D3 items later on, that will also take alot of time 
I was speeding things up today a bit, as i have no time tomorrow, but guess what, i have finished up for today and a patch is incoming in a few moments when packed together
0.2q:
- CHANGE: ALL enemies have been adjusted again to balance their level to the characters levelrange (massive changes in all needed enemyfiles and proxyequations have been done, this is what i was aiming for, i bet still not 100% but near, finally :D) ā this will also fix the issue that loot is dropping WAY too high in levelrequirement;
- CHANGE: added vanilla gambling affixes to rare gearloot to bring even more variation to this gear;
- CHANGE: increased drops of Blood Shards slightly again;
- CHANGE: Grim Souls Buff ā changed visual for each charge ā now ONLY the last charge has an increased visual effect and a special endingeffect that should not be that draining on FPS then the one before; increased granted damageincrease to 24% at max charge;
- CHANGE: added new animation on both male and female for ranged1h (CrusaderSmite) and dualRanged (CrusaderSmite) ā both mainly for āBone Spearā, but i guess other skills will like this too (only for 1h guns);
- FIX: itemskill ā summoned pet from D3 item āVisage of Gunesā has been adjusted for better performance, mainly the deathparameters were causing lags;
- FIX: itemskill ā summoned pet from D3 item āBlackfeather Raimentā has been adjusted to fix the spawn issues;
- CHANGE: D3 Class - Crusader ā skill āBlessed Hammerā now has a duration, a cooldown, increased energycost, a new castanimation, can ONLY be used with melee weapons (also daggers and scepters), needs a target to attack and should have been fixed that it sometimes not triggering after zoning, removed tag for āprevent high castspeedā as this is no more issue with the new config as it seems;
- CHANGE: D3 Class - Demonhunter: āBallisticsā empowers now to dual wield ALSO melee weapons, added tag;
- CHANGE: D3 Class - Demonhunter: āFan of Knivesā can now ONLY be used with 1h melee and caster weapons, added TAG and updated TAG for statvalues (was outdated);
- TEST: changed Minor Excalibur monsterclassification and empowered it to drop items, will this lead to dropped SR progress items? ALSO REMOVED BLACKLIST ENTRY ā need some feedback on this as i do not have that much time to test today and really wanted to push this update out TODAY
Cheers.