p.13, s.1.3, "Vast amounts of additional Tékumel source material has been published over the years", incorrect verb number.
Could be changed to either, "Vast amounts of additional Tékumel source material have been published over the years.", or "A vast amount of additional Tékumel source material has been published over the years."

p.13, s.1.3 "They could be ... member of a secret society within their temple ... scholar studying secrets" -> members, scholars

p.13, s.1.4 "When numbered from 0 to 9, a roll of ‘0’ is treaded as a 10." -> treated

p.15, s.2.1.4.2 "One has merely to enter a forested, swamp of mountainous region" -> should this be "forest, swamp, or mountain region"?

p.16, s.2.1.4.10 "and yet a part in society." -> of society(?)

p. 22, section 3.5.2, first table: The birthday probabilities are skewed toward the intercalary days. Compare Adventures on Tekumel, Part 1, section 5.2 (p. 19): there should only be a 1.4% chance of being born on the intercalary days, including Kolumehagi, assuming an equal probability of any given birthday.

p. 26, section 3.6.1.1: "The Five Lords of Stability, are as follows:" Drop the comma. Same problem on p. 27, section 3.6.1.2: "The Five Lords of Change, are as follows:"

p. 249, section 20.1: "The website also has links to other Tekumel sites where you can read, download or purchase tons of additional Tekumel source material to inspire our Bethorm campaign for years to come." -> your. Also, Bethorm isn't accented here or on pages 9 & 14.

p.17, s.3.4 "The clan’s ‘business’ (or businesses) offer one or more possible profession careers for the character." -> professional careers or professions or careers (?)

p.20, s.3.4.2.3 "Nonhuman characters are assumed to have overcome these hurdles, and may therefor" -> therefore

p.22, s.3.5.1.1 "starting age of a Tsolyáni PC therefor apply" -> therefore

p.23, s.3.5.3 "A cisgendered individuals' gender identity" -> individual's

p.24, s.3.5.3.2 "Tsolyáni characters are therefor" -> therefore

p.40, s.3.10.4 (Appraise) "On a fumble, double the degree of error." -> this is the first occurence of the term "fumble" in the text—it occurs many times on subsequent pages. The intro to the system on p.13 defines "critical failure"; perhaps a note equating "fumble" and "critical failure" should be inserted there(?)

p.44, s.3.10.4 (Lawyer) "This is skill in the theory and practice of one particular land." -> This is skill in the theory and practice of one particular land's legal system."

p.45, s.s.3.10.4 (Negotiate) "Divide the average market value by two when used goods" -> "Divide the average market value by two for used goods" or "Divide the average market value by two when negotiating for used goods"

Page 34. Higher Lineage (1). I think the Family Income & Personal Wealth column has an incorrect value of x.5 for 5 Points. Given the progression of the other point values, I infer this should be x5 for 5 Points.

Page 33. Advantages. 3.9.2.1 Devices
"The normal physical characteristics of the item (for example, weapon statistics if it’s a weapon) are free, but any other Advantage points cost 1 point each – and the device gets a bonus of +1 Advantage point if it doesn’t have any inherent game function (for example, an amulet or a belt)."

What I'm trying to express is that something like a belt or piece of jewelry, which doesn't have weapon or armor stats or give its wearer any skill check bonuses or anything *on its own*, gets a cost savings when you use it as the basis for a "device". If you add stuff to something like a weapon or armor, you get its original weapon or armor abilities for free. So, charging the same amount for a "device" built out of something that didn't have any abilities of its own would be unfair.

-Jeff