As trial chambers have been added almost 2 years ago, I think it could be the time for their introduction on ccnet.

Trial chambers:
-They could generate naturally in chunks which arent claimed. (I dont have much anything to say on how they will generate as i am not sure how it would be executed.)
-There wouldnt be much change in it except removing the mace/heavy core from the loot table (prb not a good fit to ccnets pot pvp) however it could be somewhat nerfed ofc depending on balance and public opinion and could be rarer.

Wind charges:
in my opinion wind charges could be a nice fit to ccnets pvp IF it has a proper cooldown like on enderpearls.
It could be used to escape holes, push people in ganks exc.
The cooldown could be a be around 2.5-3 minutes

Armour trims + new music discs:
Flow and Bolt trims could be added to the loot tables on chests/vaults of trial chambers OR it could be dropped by the breeze with like around 30% chance of dropping either one or just one.
Also the new music discs would be a cool drop (a bit biased for adding them because i like collecting discs in ccnet)