woodelf said:
OK, so where do you put the spikes? *snip a long thing about "spikes can't go there"*
Okay, remember, we're dealing with a combat world where you are likely to, at some point in your career, be either (a) swallowed whole or (b) picked up by something several times your size.
That said, let's look at the four cursory locations on the body
Head: nothing wrong with a spike on your helmet! The Moores kenw that back when they ruled Spain, and the Germans knew it during WW1. In an emergency... a really, really, REALLY dire emergency, German soldiers in WWI did actually use their helmets as improvised weapons. Since this is midieval, Helmets could be "locked" (as a crusader helm, too blulky for the ear to touch the shoulders) or immobile (as the ever-popular "beaked" helm) and equipped with spikes on either side (like horns). I see no way for a player to accidentally "gore" themselves with their own head, and, you know, an unarmed strike can be of any origin. Hands, feet, or head. I don't see why this wouldn't hold true in a grapple.
Torso: Again, you are probably going to be grappled and held by something larger than you are, so why not have spikes on the back? When their fingers wrap all the way around you, the location of your torso spikes don't really matter. hell, even when engaging a normal-sized for in grapple, When was the last time you saw two wrestlers in the ring standing face to face and shaking each other by the shoulder blades? or lightly pushing on eachother's chest and stomach? They get in there and they wrap around each other! trying to get the optimum leverage against each other!
Arms: Look at your typical platemail pauldron. (that's "shoulder and upper arm guard")
See that big ridge? Nothing bends over that ridge. Ergo, you could put spikes on the far side of that ridge, and there would be no interference with movement, and no danger to the wearer. You could also probably put a spike on the front too, since it will conveniently bend out of the way when you move your left arm to touch your left shoulder.
Legs: Outside of the hips. knee spikes.top of the feet isn't impossible either.
real boots, with real spikes. For sale. I don't think they'd sell spiked boots that could impale the wearer. But at (pound sign)89 per pair, i don't think i'll get any.
Finally, reguarding "apiked armor" splat book art. Let's just treat it as what it is: an artist's imagining of what the narration describes. I'm sure the invisible stalker dosn't leave a ripple in the air either.