Cazic Thule and Brell Serilis was a shaky merge at first. The Brell people complained 24-7 about losing their server. A lot of the Cazic people told them to go back then.
Time heals all wounds though. (Ten seconds for a complete heal.) The two servers have merged into one and we had the same differences in jargon.
Example:
+5 Aug to Wis.
In.
Out.
Pass.
Pass.
Pass.
Out? In? Just say pass if you don't want it.
We random 500 1000 to set seed, then roll, no doubt due to the belief in people being able to cheat. Brellians (as they sometimes call themselves) like to roll D6 and assign alphabetically.
What made our merger complete was the folding of a great many guilds from both sides and absorption of CT people in Brell guilds and vice versa. After a year, I would certainly call it a success.