Ilina_Young wrote:spear and shield is specifically a setting rule for settings taking place in Greece, Rome or Persia during the Era of BC. where the weight of some rather massive spears was supported by the strength of the Phalanx working together. the reason the Spear was popular in Phalanx fighting was because it provided reach, which is a huge asset in Phalanx Combat, where you warriors were lined up in rows of people armed with spears and shields. but if you are playing in a Setting where Phalanx is the common military style, there really shouldn't be full plate armor and well, the parry bonuses of the spear shouldn't stack with the parry bonuses of the shield. but i usually rule that encumbrance penalties affect Parry and sometimes Pace. for example, if you have a -1 from your load, that reduces your parry by 1.
It could be a setting rule in something BCE, but I don't know of any off the top of my head. Weird Wars Rome may have something similar, but I'm unfamiliar with the setting. In any case, full plate armor is also part of the equation, and despite my ignorance of WWR I'm confident in saying I don't think it's there. It's not impossible, though. Individual components could be made of bronze or possibly iron. But in general full body armor wasn't a thing, and it certainly wouldn't enclose to body enough to adequately guard against AoE attacks.
It has been stated multiple times that parry from weapons and shields do, in fact, stack with each other. If someone is somehow capable of effectively wielding both, then they get the benefits of both. Going back to your BCE example, there might also be spears different than those found in SWD which can be wielded one-handed with efficiency. The idea of a rapier being reskinned as a short spear has been tossed around this thread. Still, it's splitting hairs.
The issue here is how to adequately both challenge and reward a player who has invested so heavily in defense as to make them nigh untouchable and uninjurable.