Shambling mounds have the ability Electric Fortitude:
(Ex) Shambling mounds take no damage from electricity. Instead, any electricity attack used against a shambling mound temporarily increases its Constitution score by 1d4 points. The shambling mound loses these temporary points at the rate of 1 per hour.
If the shamblalambadingdong is hit with multiple electrical attacks, does its constitution keep going up?
In other words, is the increase an unnamed bonus so it can stack with itself?
Unnamed bonuses do stack. Might I suggest will-o-wisps to constantly zap it? :)
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Isn't there a "same source doesn't stack" principle to apply here? A Shambling Mound with a Will-o'-Wisp ally shouldn't be able to build up infinite Con.
Last time I saw anything regarding ability scores and same sources, it was adding multiple instances of the same ability score to the same thing(like double wisdom to a skill). But those were not untyped bonuses, like a shambling mounds Con boost.
"FAQ: Temporary Hit Points: Do temporary hit point from the same source stack?
No. Generally, effects do not stack if they are from the same source (Core Rulebook page 208, Combining Magical Effects). Although temporary hit points are not a "bonus," the principle still applies.
This prevents a creature with energy drain (which grants the creature 5 temporary hit points when used) from draining an entire village of 100 people in order to gain 500 temporary hit points before the PCs arrive to fight it.
Temporary hit points from different sources (such as an aid spell, a use of energy drain, and a vampiric touch spell) still stack with each other."
Note that this ruling was made precisely to stop infinite temporary HP, which is what you could get if temporary Con gain from a single source was allowed to stack with itself, and makes no exception for untyped bonuses.
Not quite. its calling out hit points from things that grant temporary hit points. While the Con bonus itself is temporary, the hit points they grant are not. They don't go away first like temporary hit points.
If I end up being wrong, I'll be pleasantly surprised though. Shambling mounds and Wisps are mean.