Evony will open flats to improve the ability for ppl to war. However, with each npc clearing, more and more fillers are being used. Here is a simple solution...
Fillers are killing this game. Everyone who has an alt account is in violation of the rules. Make it so when a new account is started, a confirming email is sent out to the email address activating the account. This will stop all the new dummy accounts from being created, stop them dead in their tracks. You could even go one further by sending out a confirmation email to all existing players under 500k prestige. This would totally eliminate accounts already created on bogus email addresses.