From publisher blurb:
Bring Lair of Sword & Sorcery (LoSS) to Swords & Six-Siders. This conversion booklet provides guidelines for playing in the World of Kartharka, where combat is more brutal, treasure is more precious, magic is very rare, and chaos rules.
Demihumans are rare and feared.
Wizards, Myrmidons, and Clerics now use spell points rather than knowing so many spells per day.
New Class: Sorcerers; they summon, command, and enslave spirits for their own uses (this class can be used on its own or as a secondary class for fighters, thieves, and pathfinders).
New Levels are unlocked with experience points rather than gold.
Magic items are extremely rare, with most now simply being made of steel.
Convert monsters from LoSS quickly
LoSS templates (Story Flowchart, Story Background, Lair Outline, Lair Details, and mapping page) updated for S&SS.