P 107, 76A. Impervious Shell (Ritual)
Cost: 49; NRG: 34; prep: 1 minute; 2”rng; 1”area; duration: 20
minutes
A totally impervious globe appears, either with the caster
inside at its center or at a distance of 2” from him/her. Nothing
physical or magical can enter this from without, no magic can
be used within it, and even a prayer for Divine Intervention
cannot be sent out through the sphere. No spell will dispel it
until it expires of itself. It remains stationary and does not move
with the caster (or others within it). One inside can walk out
through the shield, but blows, missiles, persons, substances,
etc. do not penetrate it in either direction - and a person who
has emerged from it cannot get back inside, even if he/she
has only put a portion of his/her body out. There is a danger of
running out of air within the shell, moreover. Air and light also...

"Moreover, There is a danger of running out of air within the shell..." works better for me.

It seems that at some point you chose to shift from "range" to "rng". I'll stop reporting these since I'm finding so many and you can probably easily find and fix them (if they are erroneous). I prefer "range". It is your project, though. So, I will accept (as if I had a choice!) whatever you end up going with.

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.

p.182 (Hluss) "Extra Limbs: manipulative feet
Distinctive: sweetish, acrid odor" -> Formatting is missing from the ability tags, and the tag for odor seems odd.
Extra Limbs: manipulative feet
Distinctive Odor: sweetish, acrid

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; ..."

p.180 (Hlaka) "with three frontally placed, bright blue eyes with nictitating membranes set in a bony crest." -> the eyes, not the membranes are set in the bony crest "with three frontally placed, bright blue eyes—with nictitating membranes—set in a bony crest." (I've used m-dash here, but parenthese or commas would do as well.)
or "with three frontally placed, bright blue eyes set in a bony crest. The eyes are protected by nictitating membranes."

"They are bipeds, with two arms to which their wings are attached, rather like a bat." This descriptive text doesn't fit the illustration.

p.177 (Epeng) This creature has statistics for a single segment and it is a colony creature similar to the Dlikken (p.178). Should it have a special ability description for colony creature as well, to explain how the segments may be separated during combat?

p.173 (Chima) "The Chíma are very social, not hostile to visitors, and fascinated by design, decoration, and body - paint!" -> is the exclamation mark intentional?

p.171 (Aqaa) "A victim swallowed by the Aqáà has a only a small chance of cutting his way out" -> "A victim swallowed by the Aqáà has
only a small chance of cutting his way out"

P 110, 88A. Astral Projection (Psychic)

Such spells as
Ascertainment (no. 2C), The Seal upon the Powers (no. 18),
The Sphere of impermeable Quiescence (no. 20),...

Capitalize Impermeable?

P 116, 104A. Protection (Ritual)
Cost: 20; NRG: 17; prep: 2 rounds; 1”rng; 1”area; duration: 2
minutes
Multiple beings may be protected from sorcery by this dome
of nacreous, translucent crystalline force. This blocks all other -
planar power, and those protected can neither use sorcery
(of either the "ritual" or the "psychic" kinds, or magico -
technological devices that operate upon such forces), nor
can spells from outside touch them. They may continue to
fight physically, fire missiles, etc. normally. Living opponents
can strike or hit them with physical weapons similarly. The
Undead, demons, and creatures created by sorcery cannot
enter this sphere or strike at those within physically.

I suggest, "...or physically strike at those within."