Steverooo said:
Maybe I just don't have a good conception of what "Gargantuan" means.
80 feet long, according to the PHB. To me, that implies a decent number of scales that work for this. Besides, do you REALLY have to have two intact scales for the front/back? Couldn't the back be two slightly smaller scales fitted together?
Anyway, since we're now in the House Rules forum, here's what we've come up with for my campaign. It's a bit long, but I could use some feedback.
All creatures, when killed, can be harvested for Chitin/Scales (which can be used for plate-type armors, including Scale Mail) and/or Hide (used for leather-type armors). The exact amount depends on how big and how tough the creature is. Each creature gives a number of "points" of material equal to its HD plus its Natural Armor. (They should be something other than "points", but I'm still working out the math on weights; "stone" probably would work.)
Basically, all creatures fall into three categories:
Exoskeletal (Insects, Arthropods, Arachnids): NA+HD points of Chitin. Example: an Ankheg has 9 NA and 3 HD, so killing one gives 12 points of Chitin.
Chitin is used for plate-type armors, but usually comes in one large piece, so it's never a problem finding pieces of the right size or shape.
Soft (Mammals, Birds, Amphibians, Fish): NA+HD points of Hide. Example: a Bison has 4 NA and 5 HD, so killing one gives 9 points of Hide.
Scaled (Most reptiles, including Dragons): NA points of Scales, HD points of Hide. Example: an Ancient Red Dragon has 34 HD and 33 NA, so killing one gives 34 points of Hide and 33 of Scales.
Scales, unlike Chitin, are a bit more limited in size and shape. Armors requiring intact plates (Breastplate, Half-Plate, Full Plate) require the creature to be at least three sizes larger than the person the armor will fit.
Now, you want to know what you can make from it. Every armor requires (AC+2) points, times a size multiplier: Small is x1, Medium is x2, Large is x4 (and my house-ruled Half-Ogre is x3).
Bucklers are 1xSize, Small Shields are 2xSize, Large Shields are 4xSize, Tower Shields are 6xSize.
So, a Medium Breastplate is 14 points. Medium Full Plate is 20. And so on.
The DM could tweak the numbers a bit based on how the monster was killed. If you dumped a cow in acid, the amount of usable leather will be much smaller than if you cleanly decapitate it. The amounts given above are more of a best-case thing.