Oriental fantasy or Xian Xia does not know if you are interested

http://forum.audiogames.net/viewtopic.php?id=24548

There isn't anything quite like Sryth, although  Sryths story rather dicreased as it went on and the game became a blatant money sink which was why I stopped playing.

Metroplexity is worth a go since it has great story and quests, although the few adventures a day mechanic can get somewhat irritating, Twilight heroes is also a good game, though not being as much a fan of superheroes it was less my thing. Puppit nightmares is also highly worth playing since it does have a great story, although there most of the actual story comes from interacting with npcs followed by massive bouts of tactical combat and dungeoning .

Getting away from the world of browser games though, for these sorts of things I can highly suggest several gamebooks.

At the moment I'm trying out the delight games ones which are really like sryth, ongoing story, limited hp and manner, and at least in some entries like the wizard's choice ones, a fantasy setting too.

The hosted games and choice of games titles are always worth a go and great fun, in particular if your looking for a great fantasy story I suggest fatehaven from hosted games.

then of course there is the fighting fantasy project which has a hole range of gamebooks available, many such as trial of alabar's tomb with your classic fantasy feeling.

Finally, if your not afraid to roll your own dice etc you should give project aon and the chronicles of arborell a try. Project Aon is actually the series Sryth was based on, with you choosing powers at the start of each book and then having to survive. You do need to roll your own dice and write down your own stats for those, but they're definitely worth a go.

Hth.