Councils.
Spells can be used as flares if necessary, provided by those with basic black magic skills. I am uncertain who is alive and well enough to assist, but I will send out the call.
[...................................] You are likely correct. The group meant to reach the top of the tower will need to be selected carefully [...........] with full knowledge that not all of its members will descend. I can nominate several members of my guild. If it is found acceptable by my peers, I will also volunteer.
Healers are difficult to come by; if the Bards' Guild can assist with such, it would be appreciated. Many of our white mages are worn out to the point of ineffectiveness.