So how does one handle something like this?
If I have a gargantuan creature (one that occupies a space 20' across) but he's standing on a 10' ledge, do I consider him to be balancing? squeezing? Is it easier for him to fall? What if it is a 15' wide ledge? or if he's at the corner of a pit such that the 10' square in 1 corner of his space is over the edge?
Any thoughts would be appreciated as I will be dealing with this scenario in the near future.
Thanks.
I would use squeezing rules for both the 10' and 15' ledges.
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Each size increment increases a creatures height, width, and depth two-fold. Assuming the ledge will support the creature, I suggest determining the width the ledge would be for a medium creature and using the mechanics for that.
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10'/2^4...ie:
10'/2 = 5'
5'/2 = 2.5'
2.5'/2 = 1.25'
1.25' to a medium creature would mean DC5. No roll is needed unless other modifiers raise the DC to 10 or greater.
The Acrobatics rules don't have any provisions for creatures other than Medium-sized, so you're sort of on your own here. As written, an ant has to make a DC 20 Acrobatics check to crawl along a surface several times wider than it is (2 inches or less), and so will fall off nearly every time.
If you wanted to extrapolate based on width of surface vs size of creature, you could, and I think that would likely make the most sense. It might introduce unnecessary complexity - I agree with the above poster who suggested the squeezing rules.
Broadly speaking, the DCs for Acrobatics seem to be:
Greater than half your space / DC 0
Between half your space to one-fifth your space / DC 5
Between one-fifth your space to one-tenth your space / DC 10
Between one-tenth your space to one-twentieth your space / DC 15
Less than one-twentieth your space / DC 20
You could extrapolate those numbers out to a Gargantuan creature, so a 20' space, which would suggest that neither situation would require an Acrobatics check to walk carefully across unless they were trying to go at full speed or it was slippery, unsteady, at an angle, or covered in rubble.