Girallons are a pretty cool monster, even though they originated in third edition D&D. Like the grick, I think Wizards of the Coast managed to dig out a bit of folkloric ore here that somehow didn't make it into the tomes and grimoires of Advanced and Second edition D&D. (Basic players: hush. It didn't have 4 arms, so it doesn't count).
Way back in 2009, the somewhat-and-possibly-unjustly-reputationally-tarnished James
Maliszewski also turned his attention to the girallon, although he took a different direction than I'm about to take. Consider all of this discussion to be linked to the OGL.
James pointed out that the four-armed white ape has its origins in the Barsoom novels of Edgar Rice Burroughs. In those books, the apes were 15 feet tall and really, really dangerous. If you're viewing the girallon as a re-skinned copy of the Barsoomian white ape, then the 7 hit dice given to them by the SRD was actually pretty small. I think of 9HD as being something that correlates -- because of the hill giant -- to something that's about 10ft tall. Something 15ft tall ... that's more in the range of 12 hit dice as far as I'm concerned. So, I think James got pretty close to the Barsoomian ape with his writeup, but perhaps not to the intentions of the girallon.
Here is the version that James created (all open game content):
Girallon
Number Appearing: 1d4+4
% in Lair: 10%
Alignment: Neutral
Armor Class: 6
Move: 12
Hit Dice: 9
Attacks: 4 claws (1d4+2), 1 bite (1d8+1)
Save: F7
Morale: 9
Hoard Class: XX
XP: 1000
The girallon is
a fifteen-foot-tall albino ape-like creature, lacking hair on its body,
except for its head, which also possesses a large, fanged mouth. A
girallon has six limbs, the middle set of which can be used either as
arms or as legs, depending on the circumstances. These creatures are
strong and dexterous and possess remarkable intelligence, with some of
them even able to craft crude weapons and other implements. Girallons
typically live in small family groups led by a dominant male.
Fortunately, girallons are rarely encountered, as they prefer to dwell
in out of the way places, particularly the subterranean ruins of past
civilizations. Girallons possess infravision of up to 60 feet.
I think it's too powerful, because I see girallons as being -- basically -- smaller than this. They are specifically only 8 feet tall and are described as being cousins of the gorilla. In other words, I think what James did is very cool, but that he should have named it a "White Ape-Thing of Mars" instead of tacking on the name of an existing, less powerful, creature.
I stumbled across girallons recently because they figure into one of the adventures in the Razor Coast books that are being produced for Frog God Games. I had to prepare a converted Swords & Wizardry version of the girallon. How to go about it? Well, the first thing was to take a look at James's version, and I rejected it for the foregoing reasons, and the fact that the author in the Razor Coast adventure had definitely not treated it as a 15ft tall creature. The numbers were just too large for that to work. Basically we're seeing the conversion being pushed in a particular direction by the relative power levels of 3e/PFRPG creatures to one another. If you diverge too far from the web-like network of relative strength in the SRD, you end up creating problems for yourself later on, if you do lots of retro-conversions to old school. I like to think of this kind of backwards conversion as a SWitchback, since it's a neat little use of SW, when I use Swords & Wizardry ... yeah, I know, it's totally cheesy, but DO I NEED TO REFER YOU TO SIMON PEGG'S DEFENCE OF NERDS? Do I? I didn't think so, because if you've read this far you are a nerd like me. Just sayin',
That was a digression. Mea culpa.
Let's get back to the topic of four-armed apes, and ignore how that's a sentence you wouldn't really expect yourself to be writing or reading in a "normal" life. Four-armed apes. This is what I decided to use for my girallons:
GIRALLON
Hit Dice: 5
Armor Class: 6
[13]
Attacks: 4
hands (1d4), bite (1d8)
Saving Throw: 12
Special: hug
and rend
Move: 12
Alignment: Neutrality
Number
Encountered: One, 1d4, or 1d10+5
Challenge
Level/XP: 5/240
Girallons are savage, magical cousins of the gorilla, with four arms rather than two. When moving on the
ground rather than through the trees, a girallon walks on its legs and lower arms. An adult girallon
is about 8 feet tall, broad-chested, and covered in thick, pure white
fur. It weighs about 800 pounds.
Girallons
live in troops led by a dominant male. Solitary girallons are usually young
males looking to start their own troop. Girallons are very territorial and tend
to attack intruders without warning, including strangers of their own kind.
Groups of girallons may attack in a line to drive prey toward a cliff or other
hazard, or quietly form a ring around their target and suddenly close in.
Stat block for Swords & Wizardry:
Girallon: HD 5;
AC 6[13];
Atk 4 hands(1d4), bite (1d8);
Move 12;
Save 12;
AL N;
CL/XP 5/240;
Special: hug& rend.