Wandcaster

Damage: 1d4 Bludgeoning + 1d4 Radiant
Mods: Spell Attacks +1, Spell Attack Damage +1
When you roll a 20 on your spell attack roll with
this Magic Weapon, the target takes an extra
1d12 damage of the spells damage type.
Once per day, as a bonus action, you may
modulate the damage type of your spell attack to
another magical type of your choice.
Requires Attunement.