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Do it at busy times, just farming around the boss until an group assembles is also an way.
As world bosses drop set pieces some zone bosses are more popular than others.
As others have said ask in zone if anyone is doing world bosses or hang around and hope a group comes along.
If you're in a guild ask if anyone wants to spend some time clearing all zones bosses/dolmens and get a little group going.
@Turelus - EU PC Megaserver "Don't count on others for help. In the end each of us is in this alone. The survivors are those who know how to look out for themselves."
Just start to beat him, somebody will join you passing by. In many cases it works better than asking in zone chat.
PC|EU
- Behold: the Staff of Magnus.
What? What happened? Where is it?
- You stupid, I've taken it just now.
- By the shining trees of Aldmeris. We have been burgled. But how?
That staff was an illusion. Where's the real one?
- Oh... ok.