Emmelise shrugs "Well everyone knows of the Red Doors. They're the front entrance to the fortress, so called as they were constructed by the Eld and made of Areonite(a coppery red metal from Areon, the home planet of the Eld) as appealed to their alien tastes. Regarding the Alchemist's Door, I'm afraid I'm not the best one to ask, as it is more the purview of sorcerers and other arcanists than priests. You'll see the path to it when you are about two thirds of the way up the mountain. I've never seen it myself, but it apparently appears as the facade of a door, carved into the rock, surrounded by arcane symbols. Most believe, and I concur that it is another creation of the Eldrich sorcery as they had a penchant for gates and portals and teleportation but I have no clue as to where it might lead. It could be an entrance to the dungeon, or a portal to Areon, or a gate to hell itself for all I know. Every now and then we see folks in Muntburg with reagent stained hands who believe they have unlocked its secrets, but inevitably they either come crawling back to town when their supplies have been exhausted, or one of the mountain folk will find their carcass a few weeks later, the victim of the bandits or wild animals that infest the mountains...
If you are truly interested in that route, perhaps you may ask the magic user sitting over there. I believe his name is Climent.