Originally posted by Tsyr:
Not to make this sound personal Tsyr, but if I was a player in your game, I don't think I'd want to know these things ahead of time. A big part of the fun of D&D and any RPG for me is exploration and discovery. Granted, the counterspell thing should be told to spellcasters, but the other ideas (which I personally think are really cool mods) aren't something the players really need to know before they encounter it in game. If you let the players have this knowledge, it becomes MUCH harder for them to resist the temptation to meta-game. Heck, with what you said above, even the best role-player would be leery of taking a magic item from a spellcaster who was still known to be alive. None of the things you are proposing above are rules mods- they are simply flavor for your world, and flavor details don't have to be disseminated to players before hand.