I think there might be plans for this at Jagex looking at the mages walking south of Fally. Invulnerable for certain spells; Earth Mages resist earth spells, Water Mages water spells etc. I think the Slayer Skill works somewhat the same, some monster can only be killed with certain weapons. if weapon used=draglong, on=icewarrior, then maxhit=12 if weapon used=dragmace, on=icewarrior,then maxhit=20 They could easily give advantages to certain weapons by in- or decreasing the max hit. Still it would get somewhat Pikachu.