Hi,
Checking myself on a couple mechanics questions from Undimensioned and Unseen:

1. If the Spawn of Yog is exhausted due to evasion, does it still move to another location at the end of the Enemy Phase?
2. Does an Investigator have to be on a location to trigger it's free trigger actions, or is it only if the text on the location says "an investigator at this location...?"

And also a general rules question: If an ally can soak one damage and one sanity, and a monster does the same amount of damage, can the ally take both simultaneously before it is defeated, or does the player have to choose which one to take, then the enemy is defeated, and then the other damage or sanity must go to another source?

Thanks for the help!

1. If the Spawn of Yog is exhausted due to evasion, does it still move to another location at the end of the Enemy Phase?

Yes. Being exhausted only prevents an enemy from moving during the move portion of the enemy phase.

2. Does an Investigator have to be on a location to trigger it's free trigger actions, or is it only if the text on the location says "an investigator at this location...?"

You need to be at the location.

And also a general rules question: If an ally can soak one damage and one sanity, and a monster does the same amount of damage, can the ally take both simultaneously before it is defeated, or does the player have to choose which one to take, then the enemy is defeated, and then the other damage or sanity must go to another source?

Yes they can take both. All damage from an attack is assigned simultaneously so an ally can die from damage and horror at the same time.