It seems the European servers need some testing done before the Open Beta of RaiderZ starts. Unlike its US brethren, EU servers will be tested for only one day – Monday, the 22nd of October. However, still unlike their US brethren, stress testers will get to keep their stress test character in the open beta. This will give the stress testers a distinct advantage because you can level a lot in one day (if you are looking for that kind of advantage). This will help distribute dedicated RaiderZ outside of the starting zones and make things more bearable the day of the starting rush. Besides, you get to kill some monsterz like we did in the US stress test (this is a level 11 boss Queen Teresis that helps you craft some nice items)
Official info on the EU stress test can be found here.