You do not need a full party, if you bring players at or near level 75. It's recommended to at least have a melee fighter and a mage, however.

你要一个满组的团队如果你带一个75或者接近75的玩家。仍然推荐至少有一个格斗家和一个魔法师。

youdao

When Chinese players entered the arena, you may see a little boy near Yao Ming.

中国队入场时，你可能会看到姚明边上站了一个小男孩。

youdao

Just as the Yankees' age isn't anywhere near so much a problem as you'd think, though, neither are injuries to prominent players going to sink them.

WSJ: The Yanks Aren't in Trouble��Yet