Yes Ywain has a good population. The last time the graph was updated, about 7 months ago, it showed peak at just over 3k and almost no decline over time. We do not know exactly what the population is today but based on the past graph trend the peak population should still be over 2500.
Ywain info:
Server population was declining and to help keep server population up Mythic was clustering servers together. As the player population continued to shrink, Mythic needed to continue clustering servers but they had a huge problem, the database of old characters was becoming so huge (on the existing clusters) the database was becoming unmanageable. Because the existing databases were so huge, Mythic could no longer combine the databases, which meant they could not form a new cluster (yet they needed to cluster the final servers together to keep the population up to keep RvR viable).
Mythic’s solution, create a new server that everyone, all active players, will transfer to (everyone transfers except Mordred and the Coop). There are 10 Ywain login servers that are just character holding areas. The 10 login servers allow players to transfer up to 100 old characters to the new server, but Ywain 1-10 is only one server.
Mostly it does not matter which Ywain you use, as all Ywains are really just one server, but housing on Ywain 1-3 is very full so if you are thinking of getting a house I would use a different Ywain than 1-3.
Charplan is a great character builder. It is a downloadable program and has all the updated stats.
Valmerwolf has great maps. For a good UI you can check the
UI board.
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The art of war is simple enough. Find out where your enemy is.
Get at him as soon as you can. Strike him as hard as you can,
and keep moving. - Ulysses S. Grant
Only the dead have seen the end of war - Plato