Blade of Sanctuary (Patreon)

Weapon (longsword or greatsword), very rare (requires attunement)

The most holy of weapons, granted only to the most righteous to lead the way to salvation. You gain a +2 bonus to attack and damage rolls made with this weapon. If you are within 30 feet of an undead or fiend, you gain an additional +1 bonus to attack and damage rolls made with this weapon.

Blessed Light. You can cause the sword to emit a holy light in a 15-foot radius and dim light for an additional 15 feet for 10 minutes. The light is sunlight and while it shines, the blade deals an additional damage die as radiant damage. You must maintain concentration on this feature as though concentrating on a spell. While the light is active you and allied creatures within 15 feet of you have a +1 bonus to AC and advantage on all saving throws other than your own Constitution saving throws to maintain concentration. Once you use this feature, it cannot be used again until the next dawn.

Righteousness. If an allied creature is reduced to 0 hit points within 10 feet of you, attacks you make until the end of your next turn are made with advantage.

Wielders of these great blades would journey ahead of their companions, a shining beacon to victory. Bathed in their holy light, armies rallied to battle with renewed fervor and intensity. Though many a soldier would fall over the course of a campaign, those who held a Blade of Sanctuary could weather the harshest of crusades, even if they returned alone.