Serpent Kingdoms: Fang of Sseth troubles

[Deaths_Fist]

So I was reading Serpent Kingdoms the other day, and realised the Fang of Sseth's 8th-level ability, Favor of Sseth, is about the most vague ability I've ever seen. Sure, it makes you invisible for eight hours. But is it just once, ever? And only immediatly after attaining 8th level? If so, that's the worst ability I've ever seen.

Has anyone else seen any errata somewhere for this? Anyone with inside information who can clarify? Anything??

 

[Sejs]

Generally abilities like that are 1/day.

Additionally, if it says it lasts for up to 8 hours, and you get it at 8th level, I would likewise assume the duration to be 1 hour/level of the PrC.

 

[Deaths_Fist]

Strange that they would leave out important details like that, though. An improved version of Greater Invisibility, 1/day for eight hours? Seems a bit much. Once a week more like it. Again, strange that they don't specify. Ah well.