Erudin/Paineel Faction?
 

I am dubious to Paineel and want to increase my faction so that I can buy a Hole key. If I kill Erudin guards to improve my Paineel faction, will I be able to go back to my current Erudin faction after getting the key by killing Paineel guards? Is there a better way?

make yourself a key mule just to open that door. just gotta make sure someone else in your party also was responsible enough to have done likewise.

Have a necro cast ignite bones and go buy key during the 18 seconds you have skele illusion for.

Kill lots of kobolds in Tox ;)

Well, apparently I needed just one Erudin guard kill to get to apprehensive and be able to buy from the merchants in Paineel.

The skeleton band will play songs about you ;)