I've read through both guides a few times, and given that I'm running my first game tomorrow with a few friends, I have a general question. Is it correct to say that the scenarios for summoning/encountering monsters in MoM are very limited? That is, they're available largely (or only?) in the Keeper Action cards, and for the larger creatures it generally involves a sacrifice?
Seems to me that a few stories (in particular, story 4) are rather light on the "critters." As far as I can tell, investigators will spend about 2/3 of their run on this map simply exploring, with the keeper's role relegated to "springer of Scooby-Doo traps" via his regular abilities and the potential use of mythos/trauma cards. This might shift somewhat depending on which story choice you made, but it seems that it's only when the two mi-go escape their vents near the end that the investigators will encounter them (and possible Helen Detaigne).
That's all well and good; combat is more involved in MoM than Arkham, and the creatures seem a bit harder to kill. I just wanted to make sure I'm not missing some crucial mechanic in the game. Do any of the mythos cards involve the appearance of a creature, or is it always limited to the Keeper Action cards available at the beginning?
Also, this is just an aside, but I'm sure a number of Arkham players will be eager to transfer Arkham creatures to MoM for custom scenarios. Very curious to see how those stats and attacks will turn out.