So I'm a bit late to the party, but I have an offering regarding the climactic encounter with Depora. I, too, am hopeful that an epic scene will unfold atop the Cyphergate in front of all of Riddleport. How awesome would that be?! (My PCs are currently back at the Gold Goblin after surviving the Boneyard Ambush. They were able to sneak in through the back door and catch the guards unawares. I have an especially charismatic bunch and a fight hasn't broken out ... yet. And, incidentally, we ended our last session with Saul hiding under the dining room table as his trusted guard Hans tries bluffing! Pins and needles! hehe)
I'm yet to see how this actually plays out, but in the hopeful chase that will ensue up the slope of the Cyphergate, I'm reluctant to rest the success of the PCs' pursuit on a single skill check: Climb.
I can already envision the disappointment of my players as they fail these crucial roles and Depora slips away without a satisfying stand-off.
So, I decided to add some scaffolding at the base of the Cyphergate, and justified it being there for the Cyphermages' use, as they study the mysterious runes. It's designed to take longer than the string of Climb checks specified, but I figured it would add some dynamic action as they rush around dumb-founded Cyphermages, perhaps making Reflex/Acrobatics rolls to avoid tripping over them as they tinker away at the wall. It will also help to include all the players, even those with crap for their Climb check. Once they get to the top of the scaffold I've made, they'll be high enough up the Cyphergate that Climb checks will no longer be necessary.
I'll post a follow-up about how it actually goes!