如晨星所言。
[PHB pp.45]
Like a member of any other class, a paladin may be a multiclass character, but multiclass paladins face a special restriction. A paladin who gains a level in any class other than paladin may never again raise her paladin level, though she retains all her paladin abilities.
因此,有些进阶就有一个小标注,意思就是升这个进阶将来还能回头继续升圣武士。CA里最乱编的那个圣武士贼的进阶Shadowbane Inquisitor也有这样的小标注。而且还允许PC将来随意地去升贼,升圣武士,升Shadowbane Inquisitor。@_@~~~
多嘴一句:Monk也有如此的限定,都属于单行道的职业。