This system was actually written for Openquest, but it is 95% compatible with versions of Runequest as is, and can be easily modified the rest of the way.
All in Game Stats
Runequest Thursday #38 - The Beastlords!
A cabal of sorcerers variously known as the Bestiary, the Zoo, or the Cult of the Beast has as its adherents some of the more atavistic members of the art, many of whom are notably large and physically powerful.
Runequest Thursday #37 - An Infestation of Carcharids!
Carcharids are shark-like humanoids, named after the Shark God, Carcharias, from which they claim descent.
Runequest Thursday #36 - The Sea-Wolves of Wachaza!
Sea-wolves are savage but cunning predators of the deep ocean. They sometimes hunt in packs and behave much like terrestrial orca in regard to hunting methods and pack structure.
Runequest Thursday #33 - Scorpionids!
Ever since the earliest iterations of Runequest there have been scorpionmen, horrific creatures of chaos that no right-thinking person would have anything to do with.
Runequest Thursday #32 - New Creature, Titanoboa!
Titanoboas love marsh waterways, with plenty of low islands, scrub and quiet pools. Ambush hunters they are slow on land, attacking by surprise often from beneath the surface of murky shallow water.
Runequest Thursday #31 - Sigin, Ex-Red Moon Halberdier
Sigin is a tall attractive woman of Sartarite descent who wears the decorated armor of the Red Moon Halberdiers, a crack regiment in the Lunar Army.
'The Terrible Old Man' (H.P. Lovecraft d20)
This very short but creepy and evocative story by H.P. Lovecraft revolves around an ancient sea captain , three thugs that attempt to rob him, and the cluster of Ghost Pirates that appear to avenge the crime!
Runequest Thursday #30 - The Sunken City of Rob-Cradle!
None of them knew the name of the city when they discovered it, or why it was there, so far below water level, but were intrigued by its mystery and, as they explored it, became convinced of several ominous things …
Cretaean Mirror Lizard (D&D 5E Bonus Content for ‘In the Footsteps of Hercules’)
A Cretaean Mirror Lizard is a species of mutant beast that has a thick, stony hide that looks as if it is covered with an array of reflective, mirror-like plates and scales.
Runequest Thursday #29 - Theudulf the Learned, Grey Lord of Lhankor Mhy!
Theudulf the Learned is a Rune Lord of Lhankor Mhy, one of the Grey Lords who delve into ancient ruins, forgotten temples, or the occasional nest of Chaos in search of hidden lore.
Bestial Bailiff (D&D 5th Edition Epic Fantasy Monster)
These physically powerful, armored, beast-headed Devils keep things moving at the Temple of the Judges of the Dead in Hell and provide security for it. There are three general sorts of such monsters, distinguished by being Hyena-headed, Lion-headed, and Wolf-headed.
Runequest Thursday #28 - Weapons, Armor, and Encumbrance for Runequest!
My weapon and armor system is based on medieval and ancient warfare, from fightmasters like Fiore di Liberi, to Byzantine military treatises bearing the imprint of emperors or medival writers like Froissart, to secondary and modern commentaries.
Runequest Thursday #27 - Weapons and Armor of the Knights-Marshal Verse, Runequestified!
This article puts into Runequest game terms elements from author Clint Staples’ “Knights-Marshal of the Commonwealth” heroic science fiction milieu!
The Temple (H.P. Lovecraft d20)
This article examines the properties of the "very odd bit of ivory carved to represent a youth's head crowned with laurel" that appears in the H.P. Lovecraft short story “The Temple.”
Harekin in 5E: People Long of Ear & Stride
Long of ear, long of stride, and fierce defenders of their homesteads, Harekin are a prolific people who share all the noblest traits of the common rabbit.
Runequest Thursday #26 - Kazakorang, the Dream Dragon
According to the Borderlands Campaign pack for Old School Runequest, there is a dream dragon that makes its home in a geographical feature of the region known as the Five Eyes.
Runequest Thursday #25 - More Feats of Arms!
This is a grab-bag of feats, useful to any adventurer certainly, but more useful to some than to others.
Hyperborean (D&D 5E Monster)
According to legend, many centuries before the current era there were a number of migrations by giant folk from their distant northern homeland of Hyperborea to the lands of mainland Greece.
Kerber (D&D 5E Monster)
Kerberoi are massive, three-headed, humped monsters covered with irregular, dark gray spots, and are native to various abyssal, infernal, and evil-aligned planes.