Under the magic item creation rules, can a character create a single item which can function as either a stave or as a metamagic rod or as a Pearl of Power? Would this incur a cost increase/decrease over creating each of these items individually?
On one hand, this combination improves action economy since the character only has to draw the combined item once, rather than drawing each component item separately. On the other hand, it constricts the versatility of the combined item, since each of the component parts cannot be split up, sold, or given to other party members.
These items are all slotless, so there should be no cost penalty, but on the other hand they all have to be held to use, which one could say constitutes a slot in some fashion or form. On the other hand, their granted effects are all mutually exclusive and you can only use one in any given turn.