Krusten will follow Zork only if someone offers to stay with Faerydae. If no one stays then she will stay and she will not give into persuasion.
Out of Character: There may not be anything where we're at but just in case I will take west if you guys want to take south and we will probably meet back.
In Character: "May our great Healer go with you to find and bring back the key to give these girls new life..." Says Faerydae in a most authoritative way. She feels like if she is blessing an army for battle. She then tends to the girls.
Out of Character: We are split in 3 and obviously that is not good even more with my character alone. I will wait in my position to hope our new adventurer comes straight ahead and meets up then I will return to where Krusten is now. You can wait or choose to open the door now, up to you.
Out of Character: Ditto, you're probably up for actions but personally I wish our Dungeon Master would move ahead rather than wait for everyone to post specially when their character isn't at any important juncture in the game.