I've only brought one in so far, and it's really just a tweaked version of an old official rule - lowering Mystic Defense. In 4E spellcasters can no longer lower their own Mystic Defense to cast spells on themselves. This caused a bit of frustration for our group's Wizard and Nethermancer trying to beat their own high MD (having to weave threads and then having the spell fizzle afterwards is a minimum of two rounds wasted).
Lower Mystic Defense Combat Option: Magicians know how to manipulate their natural Mystic Defenses to make it easier to cast spells upon themselves, although it does leave them vulnerable to other casters. Magicians can automatically reduce their Mystic Defense to 2 at the start of the round, but forfeit any extra successes generated when casting spells upon themselves because of the focus needed. He has normal Mystic Defense -2 for the round against any spells cast at him by other magicians (he is essentially Blindsided).
Originally I had this as "lower MD to 2 for first success, but extra successes are 5 and over the normal MD", but this was too messy. I think now there is a good balance and our magicians must ask themselves: "Should I cast this as normal and maybe add some karma to get those tasty extra successes? Or do it quick and dirty by lowering my MD but only getting one success?"
Anyone care to share their 4E house rules?
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