I'm wondering if there's
a specific clue about the D.
climb: Mount
Fire Arm: Gun
Fishy Pitch: Abad
great city: goblin city
I think the d sort of falls into place with the context of the rest
Great work on this one G55
I only guessed at the reasoning for the end bit so I hope it's right because Your answer makes sense with it.
Edit: Actually Fire Arm against fishy pitch fired upon; like Gunned? phoneticaly gund?