Originally Posted by
KorvinStarmast
OK, I am not sure how that reads as "omniscient" rather than "plot service" but I have no dog in that fight. But let's examine some in world ideas here
1. I am pretty sure that there is a "comprehend languages" spell, and I will guess that there are feats that do something similar but I am not 3.5e expert so I can't point you to them.
2. Tiamat may have bestowed "comprehend languages" on the oracle.
3. There is a D&D 5e monk class feature that lets you understand all languages, but I am not sure if there is a 1 to 1 mapping of that to a similar 3.5e skill. Ya don't need omniscience, just a class feature.
Tongue of the Sun and Moon (5e)
Given that 3.5e is a bit more 'overpowered' than 5e, I'd guess a monk in that edition has something similar.
(I'll check the SRD in a bit)