Rambear |
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Nobody is posting with outrage. Most people are just stating that it would cause all sorts of issues with balance.
I personally feel like going for the explanation that since Large creatures are bigger they have a smaller area of exposure relative to their total mass. Besides this, they are more hardy
Now you could argue that each Square would get covered, but a real explosion would only target part of the animal and the fire would have to move through the creature, but is stopped by it's body, essentially providing cover for itself. Whereas a human would be consumed and the blast would travel around/through a human, large/huge creatures would just absorb the blast and every part behind (or underneath if you blast from a flying vantage) would not be hit because it's body absorbs/stops part of the force and the fire.
Take as an example the fire blast against the awesome Indominusaurus in Jurassic World. Humans got consumed in flame, Dino only had half his body on fire. Should he then take double damage, or half damage?
That is besides the fact that larger creatures have thicker skin and should be able to shrug fire/acid/cold (and even force due to their higher mass) off much more easily.
Now in game this is ofcourse partly represented by SR, a high CON modifier on size increases etc. But by recalculating per square damage compared to relative part of creature affected you will needlessly complicate the game, while screwing with balance between AoE and single target effects.
AoE damage covers the surface of people. People are known to survive being caught in fire. A sword wound has a much higher chance to target vital organs, although that could also be survived.
A Game needs to be balanced. It could be said that AoE damage balances with weapons based on the fact that they do different types of damage. However, without critical strike tables (such as Rolemaster had) and simply working with HP totals you need to assume some commonality between damage types, despite the fact that they would work very differently when used in a Mythbuster scientific experiment.
So no, I don't think AoE should do more damage based on the amount of squares. If you want to rationalise this as bigger beasties being tougher and only having a smaller area exposed, or that AoE only does superficial damage, or whether you want to put it on the willing suspension of disbelief is completely up to any individual person. However, within the Pathfinder rules it is the only way to really deal with AoE damage. Feel free to make a suggestion in Homebrew about how you would balance it, and work it into your game in whatever way you want. The rules question though has been answered by referencing the appropriate rules.