Instead of a Evil Realm, why not an "Intercontinental Evil Guild"? First you choose a better name than that... then youset your cruel goals, recruit members and sends them to conflicting realms or with potential for conflict. You infiltrates your members in these realms, sometimes into two rival realms (or allied ones), and then you let your members cause the most confusion possible (according to their Machiavellian goals). You can start a guild in one continent and spread... you can merge it with your own evil religion. Instead of a realm, you will have a secrect society acting where you want.
