does anybody know how to beat the banished dream rider

anybody know how to beat these? there in uw and pretty impossible sicne when you kill one like 4 mesmer things come and when you kill those 8 more come and so on. so we made a run for it and i though to kill the wailing lord. we made a last effort to kill the wailing lord right before we all died and even though we killed him the other banished dream riders were still going strong anybody know how to beat these without taking on 100 guys?

here a pic of a banished dream rider
Theres alot of dream riders, but the strategy remains basically the same for all of them, this is assuming they havent changed them since the major update. Fighting the first dream rider you come across would go like this:

1. Pull Dream Rider to the stairs you entered into the chaos planes from and kill it. The first 3 Mindblades will spawn away from you in the open.

2. Pull those 3 to the stairs and use the stairs as a choke point to wall them off from your casters/healer and get them to bunch up in a group.

3. Repeat above with each group of mindblades, 6 then 9 respectively. Have any Ele's use Glyph of Concentration to get off their big AoE's and anyone without glyph use a few less important spells in the beginning to take the intterupts etc. before using your best spells with longer cast times.

After that first one, theres alot of different spots you can use as chokepoints as you slowly advance through the area. When they are in groups with Wailing Lord and such, always kill the Dream Rider last. Hope that helps somehow.