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The rules for monsters distinguish between the number encountered and treasure class based on whether the monsters are in their lair or not. However, unlike AD&D, ASSH has no % in Lair value in the monster description. How do you determine whether a creature is in its lair or not? Directly by design? What about random encounters (especially wilderness ones)?
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I assume wandering monsters are not in lair. The outdoorsy characters can then have a chance to follow the signs leading back to the lair, possibly finding the kin of the first encounter. In the old days, whole adventures were created out of tracking creatures back to the lair. In dungeons (way back in the day) lots of rooms were empty and could be used for the lair of wandering monsters. This is the way we did it.
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It's up to you, basically.
If you would rather have a number to work with, you could just use the "% in Lair" number from AD&D for AS&SH monsters with analogs in those rules (which is most of them).
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Thanks for thoughts on this. I like how ACKS uses %age in lair to place wilderness dungeons.