(Psi)SeveredHead
Adventurer
I think they just wanted to avoid "mental stat munchkinizing". You could bring it back, but it would be as expensive as three mental-stat-boosting books (and not stack).
Alternatively, it could be brought back as a story element. It wouldn't have rules for creation or anything like that, but could explain why this NPC has lived so long. PCs could even kill that NPC and steal the one or two potions they have lying around without much risk of game breaking (they can't make their own).
If you had to have rules for making it, it should be an epic item. By the time you go epic, that's hardly broken (IMO). You can boost your mental stats pretty high by that level anyway...
Alternatively, it could be brought back as a story element. It wouldn't have rules for creation or anything like that, but could explain why this NPC has lived so long. PCs could even kill that NPC and steal the one or two potions they have lying around without much risk of game breaking (they can't make their own).
If you had to have rules for making it, it should be an epic item. By the time you go epic, that's hardly broken (IMO). You can boost your mental stats pretty high by that level anyway...