Blood of Dragons is the only author-approved MUSH based on George R.R. Martin's A Song of Ice and Fire. Play the Game of Thrones and become a part of the history of the Seven Kingdoms:
The MUSH is not suitable for children. ICly violence is not uncommon and neither is some sexual content. We also allow players to speak quite freely and frankly on the game’s OOC channels. A good guideline for the expected level of violence and sexual content is the books themselves.
Thus, due to the adult nature of the setting, players who have not reached the age of majority for their place of residence will only be approved to join the game on a case-by-case basis. In such cases, permission of their legal guardian (and the ability to produce proof of such permission) will be required.
Effectively, this generally means that 18 is the minimum age to play at Blood of Dragons.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.