ESO needs something new for it's PvP players.
Now, like me I do both PVE and PvP. I do a lot of PVE and farming to support both my PVE and my PVP builds and I always buy all DLCs and ESO plus membership, but half of my gaming experience doesn't quite feel as loved as my other half does, jealousy I guess LoL.
A PVP dungeon/trial would be a unique mixture of PVE and PVP combined bringing maybe more PVP players to enjoy PVE as well as bringing more PVE players to enjoy PVP. It would most likely open up a whole new build meta because you wouldn't want to go in with lots of burst as you would in PvP but you would have to build more around sustain plus power overtime ​plus survivability. I figured since there combining stats like spell power and weapon power and weapon crit spell crit into crit chance same thing with penetration that it would be a good idea to merge PVP and PVE.

Thousands of ways it could be done. I'm sure the Devs with there ability to think on more of a programming orientation could come up with good ideas as well. But here's my idea
You could have it like three or four teams of four start off in their own area fight a few mobs and a boss they are dropped into or morphed or transported into an more of an open area where the room becomes inundated with mobs very aggressive mobs. Have the AI Target all individuals equally plus normal dungeon and trail mechanics, environmental traps you know all things you would see in a dungeon or trial. At this point players could also attack each other but the mobs would be stronger than normal dungeons to try and separate teams from one another but they could choose to work together and lower the amount of enemies in that room but at the same time risking taking damage from aoe's from other groups or the random team that just does not want to work together.
You could do it as one long continuous dungeon type setup or do it in a round set up like one round two round three round etc etc.
You could have the winning team based on scoring system like damage done, heals done, amount of damage blocked, objectives completed, deaths and resurrections etc etc but with healing damage and blocking being scored equally points removed for deaths maybe some points returned if you're able to resurrect an ally before a respawn timer. You can put in things like at certain times or a part of the mechanics that damaging an enemy team at that moment causes you to receive the damage maybe forcing players to work together but I would suggest probably not doing that. You could maybe have two separate winning categories like best team or best player would both receive a bonus loot. It would not be like imperial sewer the area would be smaller all the mobs would be automatically aggro'd on everybody and you would not lose half of your loot for dying
Anyways I'm sure other people can let their imagination run wild and leave their ideas for that type of scenario. Enjoy!!!