The original 2nd Edition entry from the Forge.

Moon Arc is a scimitar of Elvish Origin. Its blade is covered in elven runes. The hilt of the sword is shaped in the form of a raven's wings and is offset with a catseye agate. The handle is wrapped in leather and is capped by a carving of a raven's head. The blade is made of Mithril Steel and the handle and cross piece appear to be made out of obsidian although it is stronger than steel.

Moon Arc is a scimitar +2/ +6 vs. giants and giant-kin. The blade causes double-dice damage against all true giants. Moon Arc is semi-intelligent and will glow intensely whenever a giant is near. The blade always has a slight glow to it, hence its name. There is no way to hide the light of the blade without putting it into a sheath.

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Provisional conversion, awaiting review by DamienRahl.

Moon Arc (3.5)

A mithral scimitar covered in elven runes, with a raven-wing hilt set with a cat's-eye agate. Its history is on the 2nd Edition tab.

Moon Arc is a +2 giant bane mithral scimitar. Against giants its enhancement bonus is +4, and it deals an extra 2d6 points of damage.

Moonglow: Moon Arc always sheds a soft light, like a candle, that can be hidden only by sheathing it. Whenever a giant is within 60 feet, it blazes as brightly as a torch.

Caster Level: 8th; Prerequisites: Craft Magic Arms and Armor, light, summon monster I; Market Price: 20,315 gp; Weight: 2 lb.

Conversion notes (how conversions are made):

• Its 2e +6 bonus and double-dice damage against giants become the standard giant bane property.
• The 2e entry calls Moon Arc semi-intelligent but gives it no powers beyond its glow, so it isn't built as an intelligent item.
• The site's 3e section had a Moonarc page that repeated the 2e text with no 3e rules; that page now points here.
• Market price counts it as a +3 weapon (+2 and bane) plus 2,000 gp for its mithral blade.

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Provisional conversion, awaiting review by DamienRahl.

Moon Arc (5e)

Weapon (scimitar), rare

A mithral scimitar covered in elven runes, with a raven-wing hilt set with a cat's-eye agate. Its history is on the 2nd Edition tab.

You have a +2 bonus to attack and damage rolls made with this magic weapon. When you hit a giant with it, the giant takes an extra 2d6 damage of the weapon's type.

Moonglow. Unsheathed, the blade sheds dim light in a 5-foot radius. While a giant is within 120 feet of it, it sheds bright light in a 20-foot radius and dim light for an additional 20 feet.

Conversion notes (how conversions are made):

• The extra damage against giants follows the giant slayer from the 5e Dungeon Master's Guide, without its knock-prone effect.