I have 2 thoughts to make
1) this new improvement will take away the shortcut to dust devils which is a very popular way of training magic these days. Taking away the shortcut makes the catacombs unbalanced. I like the dungeon but don’t re route the existing short cut into catacombs and create a new shortcut on the east side of the ruins.
2) I would make the new boss requirement be - if you are off task you need a tome (this combats people who will farm) BUT if you are on a slayer task for spiders then you should not need a tome allowing you use every slayer kill on the new boss. This will create a nice training session while on task. Maybe have a minimum slayer level for the new boss as well!
Edit: thought 2 is stupid as you only need to collect all 3 tomes once to unlock the new boss so idc about it being a slayer task. BUT don’t take away our short cut to dust devils
It won't take away the shortcut! The shortcut just requires 2 clicks to go through and it's arguably ever so slightly closer to the bank :)