Yeah the elevator is blocked, there's this guy standing in front of it saying I cant go up. IDK, maybe it will open up again as I do more story missions. :/
I see now. Yes, you have to complete the story mission "Pact with Rais" because at that point the tower crew is trying to clean up the 18th floor because of the incident. After getting the Antizin, it will be open again.
Yea, ive been going through and doing everything except for the challenges. I found out that the gun challenges are borked in that if you dont have the ammo type in your inventory, it gives you unlimited ammo for the challenge, but if you already have the ammo type, it uses your actual ammo.
I had ammo for the weapons and it still gave me infinite.