Bon, pour la définition de permatration (SPOILER):
@25 = ~Permatration is a relatively old theory whereas a powerful mage can, with enough magical skill and energy, pull the life force from many beings and add it collectively to his own. By doing so, something only one other person has ever been able to do, one can in fact become nearly godlike.~
@26 = ~Karsus attempted permatration before the fall of Netheril. He made an attempt at a spell that he researched, Karsus' Avatar, but failed, with drastic results. Not only was the Weave torn permanently, but thousands died during his castings, and afterwards when the floating city of Karsus fell miles from the sky to earth. Of even greater danger was the death of Mystryl, the forerunner of Mystra, who placed much of her power in a mortal to avoid true destruction, then used what remained to repair the Weave. Mystral's powers were incarnated to Mystra. That was the first instance of an attempted permatration, a precursor to the modern schools of magic of Arcanist spells, the second occured thousands of years later, just less than a year after your birth. Mystra herself attempted permatration, and was slain by Helm in the Stonelands of Cormyr. The devestation that caused can still be seen, even after the score of years.~
Je n'ai pas trouvé de traduction dans le dico, et le mot est inconnu sur les moteurs de recherche que j'ai essayé. Je pense qu'il a été inventé pour l'occasion (à moins qu'un spécialiste des RO, et en particulier des rituels de Néthéril ne me contredisent) et que tu peux donc le laisser tel quel (ça sonne correctement en français).