Heavy Crossbow: That, I do know. But how would a cost of 9 AP play out? That way you can only shoot every 2 turns, and part of these shots will miss. Unless the crossbow is extremely powerful I doubt it is actually worth being used at the moment.
That’s the point :) It’s extremely powerful weapon, better range, better damage, better accuracy, better armour damage :)
But if BB world is rather like our XI-XII century than this weapon should not be implemented (like full plate armour, and many anti-armour weapon).