Alpha sheets can now be added to games via the edit option in the alpha sheet display. In addition, statblock embedding should also work for the [sb=show][/sb] tags. Any problems, please post in experimental features with links to the sheet and the game.
What Tarner can tell about these gates at about 20 yards away is that they display the typical strengths and weaknesses of drow war-construction. Which is to say that they are very strong against magical assault but not nearly so good against a strong, physical pounding. Iron is a magically inert compound, so blasting them almost certainly won't work. However, even iron gates are only so strong as their cross-bar. Moreover, black iron is HEAVY. So the the crossbar here is probably wooden. Maybe heavy wood, but still. You should be able to pound it with a few good strokes... if you can get close enough.