Crystar was born when somebody got the idea to use see-through plastic to make toys. In the Saga of Crystar his origin involved demon lords, magic crystals and such. Ultimately, Crystar became a living, fighting gemstone with a sword. Really, the Sage has everything you need for a good S&S game - demon lords, Chaos War, a guy named Feldspar.
CRYSTAR, Adventurer 7 (Prince of Crystallium)
STR 16 (+8) | DEX 4 (+2) | CON 8 (+4) | INT 2 (+1) | WIL 5 (+2) | CHA 8 (+4)
HP 58 | DC 16 | ATK +6 (+14 melee, +8 ranged) | SPD 2 | XP 9,700
Ability Boosts: Str +10, Con +3, Cha +4
Powers: Adapt Body (Fire/Lava), Invulnerability II, Weapon Master (Longsword)
Gear: Longsword (Potent Attack; 1d8+11, can hit ethereal and incorporeal creatures), Shield (Shield)
Since I've got Crystar up there, I might as well stat up a couple similarly themed monsters.
LVL 2 | PH 4 | MN 3 | DC 17 | SPD 2 | XP 3300
Attacks: Burning fist (1d6 + 1d6 fire + save or catch fire)
Powers: Fiery Aura (30 ft. radius; save or 1d6 heat damage), Melt Metal Weapons (save to negate), Immune to Fire
LVL 6 | PH 5 | MN 3 | DC 21 | SPD 2 (Burrow) | XP 3700
Attacks: Sting (1d6)
Powers: Immune to Fire and Cold, Resistance to Electricity (50%), Animate Object (1 at a time, stone or crystal only), Energy Cone (Psionic Energy), Dimension Hop)