*Spoilers from Bordrin's Watch*
Well, perhaps, but let me then put the question to you: Why was a climbable drain included in the adventure?
If the answer is "because the keep needed to be realistic," I don't buy it. I live in England and have visited scores of real castles. Not one had a climbable drain. More to the point, how many thousands of dungeons have been designed and successfully played with no attention to realistic plumbing?
If the answer is "because the designer really wanted to exercise his engineering skills," then I suggest he's putting a secondary interest ahead of the his DMing duties.
If the answer is "because sometimes there are just dead ends," well that's fine, but again why is he surprised that including dead ends means players will waste time (perhaps in ways that aren't fun for him or them)?
Once alerted, the orcs open this drain to prevent/delay further reinforcements from the city and to cut off the PC's they have spotted.
THATS its purpose in the game.
And yes, it also 'could' be used as an escape route by the PC's provided they correctly divert the water flows elsewhere (this can only be done from the control room in the citadel inself).
If the answer is "because it's significant, but not as a way to get in," that's great! But again, why was it climbable? Why wasn't the hole too small to crawl into, or too high in the cliff, or whatever? Or, if it needed to be climbable (for the players to know it was a potential escape route, for example), why is anyone saying it was a waste of time for the players to climb it?
Did I miss something? Seriously, not trying to be snarky, what other reasons might there be to include this climbable drain in the adventure?[/
To answer this, I need to provide more setting detail.
Bordrins Watch is a fortification and wall which spans the length of a pass in the middle of a snow capped mountain range (think, Lord of the Ring in terms of scale of this Mountain range).
On one side, is a lush firtile valley and river, the city of Overlook, half a dozen townships and serveral Dwarven structures built high in the mountains,..one of which, the PC's are investigating.
The other side is Orc territory. Bordrins Watch has never fallen to an orc attack, although its walls are now almost completely black as a result of the blood of eons of orc assults.
Bordrins Watch is the main defensive structure for the region. The pipes are on the 'safe' side of the mountain range.
Furthermore, the citadel was built in an era when the dwarves first cast aside the chains of slavery and forged their first mighty dwarven nation,..which spanned BOTH sides of the mountain range. At the time, the pipes were built without an emphasis of defence against a serious seige (their ememies were broken, there lands vast, and the mountain range was in the center of their territory).
As time went on, the orcs began to rise in numbers and slowly pushed the dwarves back towards the mountain range. Bordrins Watch was built as a means to defend the remaing half of the dwarves territory.
The citadel served as a place of training for (mainly) dwarven paladins, who servered at Bordrins Watch. The city of Overlook supplies all of the merchantile needs of this ancient defensive fortification.
So,..to answer your question, the pipes were not created with an empahsis on defence. It was sufficient if they denied access to the average NPC.
A non PC level character would of had a greater deal of difficulty in;
a. Climbing up the mountainside to the pipes
b. Travelling through the pipes without slipping and falling to their death.
c. Would of found it far more difficult to travel vertically up the pipe.
d. Would of been denied access by the cap anyway.
e. Would of had sufficient common sense not to try.
Some people feel it was a waste of time because:
a. The pipe was a dead end, the part spit up (2 opting to explore the pipe, 3 opting to continue up the road).
b. It took the PC's 3 game world hours to get up the pipe, in which the other three players managed to pick a fight with some orcs.
So the 2 players were left waiting in real time for the fight to be resolved. Some people think that this was due to my failing (Kzach for example), and I that I had a resonsiblity to make things exciting for the 2 players in the pipe, or somehow prevent the party from splitting up in the first place.
Have a read of the previous posts. Tell me what you think, based on all the information provided.
My opinion is simple,..it was just a pipe.