1) There are numerous factors that increase your chance of taming a dragons uch as being high valyrian, being chosen by r'hllor, being dany or a demon child and more. Most of them are logical with either having something to do with valyria or the fire god.
2) You need to put a leader in charge of the army and then the fort level will vanish. It is done to prevent players from raiding them for easy cash.
2) You need to put a leader in charge of the army and then the fort level will vanish. It is done to prevent players from raiding them for easy cash.