Superior players will certainly co-operate; thus, spells will in all probability be exchanged between PC magic-users to some extent. No special sanctions need be taken to prevent such exchange - although this cooperation should never be suggested or otherwise encouraged, either. The DM should leave this interaction strictly alone. This is NOT the case when PCs deal with NPC henchmen or hirelings. Non-player character hirelings or henchmen will ABSOLUTELY REFUSE to co-operate freely with player characters, even their own masters ar mistresses. Again, this matter is dealt with separately under the section pertaining to the DM's role in operating henchmen and hirelings. As a general rule, they will require value plus a bonus when dealing with their liege. If they will deal with other PCs (or NPCs) at all, they will require double value plus a considerable bonus. For example, Thigru Thorkisen, Magician in the hire of Olaf Blue Cheeks, a 10th level Lord, knows the spell, suggestion; and Olaf’s associate, Halfdan the Necromancer, requests that he be allowed to copy this spell into his book of third level spells. If Olof is willing, Halfdan can approach Thigru. If Halfdan has been at least civil to the magician, Thigru will ask nothing more than a third level spell in return,plus another spell, plus some minor magic item such as a set of three potions, a scroll of 3 spells, or perhaps a ring of invisibility. If Halfdan had formerly insulted the magician, then the price would be more dear; but supposing the necromancer had actually saved Thigru's life at one time, the cost would be reduced