Prime Materials: Spike, a wand for D&D 5th Edition

SPIKE
Wand, rare (requires attunement by a spellcaster)

You gain a +1 bonus to spell attack rolls made with this wand.

In addition, while attuned to the wand you have advantage on attack rolls against undead. 
Finally, you may replace the damage type of any cantrip or spell you cast to deal radiant damage instead.  You must complete a short or long rest before you may deal radiant damage again.

Before the Spellplague, the King of Cormyr awarded Spike to the Wizard of War, Althea McClintock, for her bravery in destroying Zeeron Malkovich, the so-called Master of Zombies.  Spike was a gift from Dawnmaster Pernell Lambert to the King of Cormyr.  The Dawnmaster confided to Althea that Lathander himself crafted the wand for her.