Following up on my previous post, would such a rule apply for a normal fight between armed and unarmed foes? If I'm using a sword, do I get 200% parry versus an unarmed opponent using MA Strikes? That sorta makes sense, but would it be unbalancing?
I'm a bit confused by this question. . .if Conan (With a Broadsword) is fighting Kane (Martial Artist with no "suitible blocking object"). . .
Both have 100 OBs.
They are standing toe to toe making 100% melee attacks.
They are both splitting OB/DB 50/50.
Conan attacks Kane, he is attacking with a weapon, vs unarmed, no modifiers 50 OB, 50 DB.
Kane attacks Conan, he is attacking unarmed, vs a weapon, without a blocking object, so his DB from parry is halved 50 OB 25 DB.
It's not that you get 200% DB from parry of the sword vs unarmed, it's that the unarmed gets half DB from parry on you.
If there is a deathly glowing hand coming my way, and I'm holding a Two Handed Sword, I'm not going to be dodging - I'm going to be hacking (which is probably why spell casters almost never try to wade into combat to get a touch bonus for their attack spell - especially when it can usually be cast from range).
Per Rasyr's comment above, you develop bonus for the medium touch maneuver using Spell Mastery as the skill. I generally treat that the same way I'd treat a subdue, and make the player declare an OB/DB split of their skill.
So if Indy (With a Tulwar) is fighting Muleram (Witch attempting the "Remove heart" spell). . .
Indy has a 100 OB, Muleram has a 100 Spell mastery
defacto Both have 100 OBs.
They are standing toe to toe making 100% melee attacks.
They are both splitting OB/DB 50/50.
Indy gets 50 OB and 50 DB
Muleram is attacking unarmed vs armed, so I'd halve the DB, give him 50 OB and 25 DB.
I guess you could double stack the deck, and halve parry for unarmed vs armed AND double parry of armed vs unarmed, but the 100% vs 50% doubling seems enough, without going to 200% vs 50% quadruple bias.
I'd be rather strict about allowing use of the Spell Mastery derived touch OB for DB. . .like requiring the spell be cast, to prevent cheap development of DB by casters. (I'd also consider touch attacks spell mastery OB to not meet the qualifications for missile parry.)
As to terrain parry. . .Jackie Chan is the best example. . . if attacked by armed people, when unarmed, you can get your full OB/DB split into parry DB rather than being cut by 50% if you make creative use of the combat area in a manner than the GM accepts as reasonable. . ."I step behind the support beam of the inn, and make the swordsman come to me, I keep moving back and forth around the beam, making jabbing attacks, but using the beam as a way to prevent slashes so I only have to worry about stabs." . . .it's "Active cover". . . .if you hide behind a table or chair it's cover, if you run around the furniture, using the terrain to your advantage, it's "terrain parry".