I periodically see notations for target numbers written this way: "18-". Is this intended to be like the Traveller usage for "or lower"?

Yes.

p.237 (Korúnkoi hiSsánu hiMissúm) "a sorcerer devoted to Change who reads gains 2 experience points in Sorcery skill."

Fixed.

p.236 (Zigzag Scimitar of Savadáno the Slayer) "a hilt that appears to be silver - chaised iron" -> silver-chased

Filigreed.

p.232 (Jade Bowl of the God - King of Purdánim) "The devices exchanges the user's mind with that of another being of the same species" -> device exchanges

Fixed.

(Helmet of the Three - Pointed Star) "Charges are checked by with d100," -> checked with

Fixed.

P 95, 48A. The Hands of Krá the Mighty (Psychic)
Cost: 16; NRG: 14; aimed; attack; 12”range; 1 target; resist; partial
The target is seized by an invisible vice of psychic force, as though by a great pincers.

Fixed.

P 97, Phantasms II, III, and IV
The Defenses lines in those three stat blocks are indented. Is this intentional?

Yes, and standard throughout all of the creature entries.

P 98, 61A. Flare (Ritual)
A visible, hissing blast of energy, scarlet in the case of Karakán, and orange - red...

Fixed.

P 99, 66A. Reflect Magic (Ritual)
If he/she makes a Resistance Check against opponent's...

Fixed.

P 104, Azure Denizen (19)
Secretion doesn't have a number associated with its "-" in the Hit column.

Correct. The secretion isn't an attack in itself - it's an effect which takes place once the creature has grabbed someone. That's why the 'damage' given for the creature's Grapple attack is listed as 'Secretion'.

P 104, Demon of the Dark (18.9)
Phobia: Fire. Make a WILL check, unmodified only for campfire - sized blazes.
As written, it seems incomplete.

Fixed.

P 106, Flame Dragon (17.7)
Flame Breath 13- 6/9/12
e
Does the "e" under the Dmg range belong there?

Yes - it indicates energy damage, rather than physical damage. It's not supposed to be on a separate line, though - Fixed.

This should have been explained in section 9.4 (p.72), but wasn't. Also fixed.

P 107, 76A. Impervious Shell (Ritual)
There is a danger of running out of air within the shell, moreover.

You may have noticed that Prof. M.A.R. Barker is listed above me in the credits. This is, in part, because large portions of Bethorm are his actual words, with the game mechanics portions converted to my Pocket Universe system. He's the guy responsible for all these 'e.g.'s, 'moreover's, and so on. Out of respect for the Professor, I won't be changing any of those things unless it appears that they are actually literally completely wrong (as in the case of his use of the word 'chaised', above).

It seems that at some point you chose to shift from "range" to "rng".

Fixed.

p.205 (Sagún “the Fungus”) "This creature is an ambient fungus" -> Should this be "ambulatory", "inimical" or something like that? Ambient usually means something in one's surroundings like sound, scent or lighting, passive environmental elements.

Fixed.

p.182 (Hluss)
Formatting is missing from the ability tags

Fixed

p.181 (Hli'ir) "It can be fought without looking at a penalty" -> misplaced modifier(?): "It can be fought without looking at it, but at a penalty; ..."

Fixed.

p.171 (Aqaa) "A victim swallowed by the Aqáà has a only a ...

Fixed.

P 109, 82A. Beratement (Psychic)
A target who makes his/her Resistance Check suffers 9/12/15 physical damage.
Do you, perhaps, mean "fails"?

Fixed.

Capitalize Impermeable?

Fixed.

P 117, 108C. Banishment III (Ritual)
Even this spell is not powerful enough to dispel the Demon Lords described in "The Book of Ebon Bindings," however.

Fixed.

P 117, 118, Expurgation I, II, III
In these spell descriptions you say E-I removes "multiple", E-II removes "more", and E-III removes "still more". Might we have guidance concerning those hinted at numbers?

Those are references to the increasing size of the area effects of those spells. See 9.6.

P 121, 119C. Combat Perfection I (Psychic)
a swordsman who has never who has never...

Fixed.

-Jeff

I'm really liking the look of the game so far, even though I'm reading it backwards right now. 😀

A couple I added to my last post after you'd replied:

p.151 (182. The Expeditor of the Skein of Destiny) -> some information under 182B really informs the whole series of spells, perhaps move information from 182B to this main heading?

p.149 (177E. Shrink Item) Just a question: would you consider assassination by helmet-shrinking a legitimate use of this spell (resistance check for the helmet 😛 )

p.147 (175A. Labyrinth I) "At the start of each minute a d100 is rolled for each victim: 1-9 = he/she encounters nothing; 10 = one of Qu'ú's hideous insect - like demon servitors is met with." -> is this meant to be d10?

p.146 (174. The Invigorator of Blades) Perhaps a comment like this under the main heading: ""Invigorated" weapons created by any of the following variants lose their special abilities when they leave the hands of the user they were created for, only one "invigorated" weapon may be possessed by a person at any given time."

p.145 (172E Waters of Death) "causing them to begin to rot and sough away." -> slough

p.140 (161A. Heat Ray) "stronger then leather" -> than

p.140, 141 (162A. Molten Fist I, 162B. Molten Fist II) "inflammable" -> Correct as written, but can be confused as the antonym for "flammable" by readers.

p.139 (159A. The Armor of Danúo) "gold - chaised" -> gold-chased

p.139 (159A. The Armor of Danúo) transposed punctuation ", furthermore; if a minion of Change attempts to use them, they return to their own Plane." -> "; furthermore, if a minion of Change attempts to use them, they return to their own Plane."

p.137 (156B. Flaming Sphere) "and may catch fire (N.NN)" -> possible rule reference missing

p.138 (156D. Molten Sphere) "this version can sink through natural stone or earth" -> "sink or rise" ?

p.129 (139A. Create Mrúr) "(except for those which species are inimical to humankind)" -> "(except for those species which are inimical to humankind)"

p.128 (136E. The Strengthener of Command) "a victim dominated by the U5 variant" -> U5 is unclear to me, (but I'm reading backward and have probably missed something)

p.125 (130B. Food of the Ssú II) "Boots of Hlüss - hide will still protect the feet," -> should a reference to Hlüss -hide boots also be present in some form in the description for the 130A variant?

p.124 (128A. NRG Battery I) "A spell of Disenchantment (no. 5) can cause the jewel to vanish harmlessly, together with the points it contains. A spell of Disenchantment (no. 5) will cause the jewel to disappear, taking the stored points with it." -> two versions of the same sentence

p.123 (126A. Contagious Fungus) ""The Book of Ebon Bindings"" -> The Book of Ebon Bindings or The Book of Ebon Bindings

p.123 (126A. Contagious Fungus) "and they dies within 2 minutes" -> "and they die within 2 minutes"

p.122 (124B. Princely Weapon II) "As above, but the weapon will penetrate the Warding spell (no. 24)." -> the A variant also states that it can penetrate the Warding Spell. Is this supposed to be different between variants A and B?

p.121 (121. The Replication of Heroes) -> How are the hit points of the targets regained after the spell ends? Do they require healing to recover or are they restored on expiry of the spell?

p.117 (108C. Banishment III) "The Book of Ebon Bindings," -> The Book of Ebon Bindings, or The Book of Ebon Bindings,

p.117 (108C. Banishment III) "are described in this work and" -> that