2) Disabling the "Armageddon" spell doesn't make sense, as for Conflux and Inferno, it's one of the interesting strategies in the game (difficult to implement) that can be easily countered with a cloak or a critical shot, or an attack slot with antimagic.
3) According to the rules, the Grail can be unearthed after 5 weeks of gameplay, but games usually end around the 3rd or 4th week.