Some weapon stats for comparison:
Light Sword - 1H weapon, usable by Fighter, Lord, Valkyrie, Ranger, Samurai, Ninja, Rogue, Bard, and Gadgeteer, of any race, including Faerie. 5-40 damage, +6 to hit, +7 initiative, 10% kill chance, double damage vs. androids.
Muramasa Blade - 1H weapon, usable by Samurai only, any race, including faerie. 7-28 damage, +4 to hit, +5 initiative, 15% kill chance.
Excaliber - 2H weapon, usable by Fighter, Lord, Valkyrie, any race but faerie. 10-45 damage, +4 to hit, -5 initiative, 25% hex chance, 5% kill chance, HP regen +1. Lightning (6) variable charges.
Avenger - 2H weapon, Fighter, Lord, Valkyrie, any race but Faerie. 11-38 damage, +3 to hit, +2 initiative, 10% kill chance, Lightning (6) variable charges.
Blades of Aesir (axe) - 2H weapon, usable by Fighter, Lord, Valkyrie and Ranger, any race but Faerie. 5-35 damage, +2 to hit, -4 inititiative, 5% kill chance, 5% KO chance, Iceball (5) variable charges.
The Aesir and the Muramasa have turned up on occasion in the Rapax Queen's chest. Avenger appeared once or twice in the Crypt Keeper's chest. Excaliber showed in Nessie's chest, and the Light Sword in Bayjin. Your mileage may vary
Nightowl2