Blades For Blackbird/Rules/Changes

This is basically the system from Low Estate, but with a couple changes of note (mostly slimming down the rules and slightly upping the difficulty)

• Changed success ranges from -6, 7-9, 10-11, 12+ to -7, 8-10, 11-12, 13+
• Dropped requirement to unlock advanced successes
• Eliminated secondary aspects
• Techniques can't give bonuses to rolls any more (and hence can only be used before the roll)
• Fewer damage boxes
• Fewer aspect points refreshed more often
• No lucky numbers