I've made a fan hack for Sacred Stones called the Fall of Thabes. It chronicles the three days in which Thabes fell under Duma's assault as mentioned in the Valentia Accordion. The gameplay is pretty much done already, featuring ten-ish maps. Instead of being basically the gameplay of Sacred Stones with original maps, I changed up the way the game is played quite a bit. The main list of details is as follows. I've ported chapters from various other Fire Emblem games that feature the ruins