How do you get criticals higher then 100 on the Large and Super Large Critical tables?
Poorly explained in Arms law, but rolls on the LA/SL table are not open ended when apllied against normal foes.
For example, a sword of man slaying rolls a 99 A slash crit. The 99 A slash and 99 slaying result from the LA critical table are applied. If the target had been a LA or SL creature, they would ignore the crit strike. Crit type I would resolve at -25 and type II at -50 to the crit roll (or 74 and 49). Some GM's allow creatures with those crit type to ignore the blow, but that is not the intent of the type.
Critical attacks against LA and SL foes are high end open ended. A roll of 01-05 is a roll of 01-05, but 96-00 means add and roll, continuin g to add and roll as long as 96-00 is the result.. This means it is VERY difficult to get a 97-00 result versus LA and SL creatures. This design seems purposeful.
Note on using ambush with the LA and SL tables; the skill ranks can only be added to the roll, not used to increase or decrease the result as per normal sized foes.