for those who care, the acronym XP was first used in Dungeons and Dragons, a fantasy role playing game by TSR, now owned by Wizards of the Coast. Much the same as people do on E2, warriors, mages, paladins, etc would battle savage monsters to amass gold and XP which allowed them to gain levels and new powaghaghahahhghgahhgahg *at this point, entropidus was consumed by a gryphon*