If you tried to fight your way your way past Urta and Edryn, wouldn't the magical barrier activate to prevent you from entering the city? Also, isn't there some magic from the city that causes people to forget where the city is located?
- The magic is updated to those who by their low corruption were allowed entry before their corruption was high enough (I do believe the number is 40%) to initially bar their entry to begin with.
- Those whose corruption is higher than allowed entry, they would not be able to find Tel'Adre.
- If the Champion's corruption is low enough when passing by the city he will see it and be allowed entry.
- If the Champion's corruption is over the limit then he should not see the city to begin with.
Now, the rules stated in the original CoC as I know them (chime in if you know differently):
- When allowed entry, then the Champion is allowed entry from that point on, no matter their corruption.
- For the Champion whose corruption was over the limit, Tel'Adre would be invisible until their corruption is below the threshold, then they will see it.
- And, again, the Champion will be allowed entry and no matter their corruption, below or elsewise, they will be allowed entry.
So, there will not be any way the combat would be needed because either Tel'Adre is invisible due to high corruption or they will be allowed entrance due to low corruption from which point they can enter Tel'Adre no matter their corruption.
Forgive the mangled form this explanation looks, my brain is misfiring (part of my disability).
Well this one part is due to in orginal game both Tel'Adre and Bizarre Bazaar not been enough fleshed out, which normaly should work as you can only access pure or corrupted pace not both at once regardless of your corruption. And since now Fen and Sav want finish D3 I think this idea will never been finished letting visit both places at any time after first succesful visit.
Entry to Tel'Adre is allowed due to low corruption even if you had a corruption above the limit and dropped below the threshold.
If allowed to enter Bizarre Bazaar due to high enough corruption, or beating the gate guard in combat, then you are allowed entry even if your corruption is below their threshold.
As for being unfinished in these cases, the word I have heard, Fenoxo has given his blessing. Now, is this due to that is the way it was meant to be or was it because they were not completed but Fenoxo et al did not want to work the thresholds to reblock if they were crossed, I have no clue.
Again, sorry for the shape of this response, brain mishaps are a major pain. :/