I realise these are predominately a Gloranthan concept, but I find myself in the position of needing to create one, The Tear of Lashar. I have yet to decide it's properties but it got me to thinking (never a good idea, really)...
- The Actorious Stone - that would be a power crystal wouldn't it? But what type; Mythic Insight or Spell Matrix (Summoning)? I think it kind of combines the two.
Which leads to the second question, is it possible to combine the types of powerful crystals? i.e. Magic Point storage and Mythic Insight specifically.
Or are these types of items best off being truly unique and tailored to the specific needs of the campaign?