Summer Blade
Weapon,
Rare
(requires attunement; cost 5000 gp)
Crafting Components
+1 weapon, a fragment of bone from an undead creature slain by the crafter, access to noontime sunlight on the summer solstice
Traditionally crafted by dwarven master smiths and quenched in sunlight instead of water, summer blades are blessed with powerful enchantments against the undead.
You gain a +2 bonus to attack and damage rolls with this weapon and deal an additional 2d6 radiant damage to undead. You also have advantage on saves against fear effects caused by the undead and can cast sacred flame as an action. Finally, once per day you can cast daylight .
Source