The blade of this golden longsword is set with four cabochon-cut rubies, and its pommel sports a ruby-centered golden sun.

A sword of virtue beyond reproach is designed to grant a measure of respite from charms and compulsions. When you wield this weapon, it functions as a +1 holy longsword if you are lawful good, neutral good, or lawful neutral.

Relic Power: If you have established the proper divine connection and you fail a save against an enemy’s charm or compulsion effect while wielding the sword, you are immune to its effects for 1d4 rounds (DM rolls secretly). The effect is only suppressed during this time, not negated. When the period of suppression ends, any effects received during previous rounds take effect.
To use the relic power, you must worship Heironeous and either sacrifice a 6th-level divine spell slot or have the True Believer feat and at least 11 HD.

Lore: Four of these longswords were commissioned from celestial dwarves by the great paladin Tardalius the Headstrong, who won favor from Heironeous for his conspicuous valor. Tardalius presented the swords to his four sons, who followed in his footsteps (Knowledge [religion] DC 20).

Prerequisites: Craft Magic Arms and Armor, Sanctify Relic, mind blank.
Cost to Create: 4,500 gp (plus 315 gp for base item), 360 XP, 9 days.