Elemental Horns 2014
2nd-level evocation
The target of this spell must be a creature that has horns, or the spell fails. Elemental horns causes the touched creature’s horns to crackle with elemental energy. Select one of the following energy types when casting this spell: acid, cold, fire, lightning, or radiant. The creature’s gore attack deals 3d6 damage of the chosen type in addition to any other damage the attack normally deals.
Although commonly seen among tieflings and minotaurs, this spell is rarely employed by other races.
At higher levels
When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 2d6 for each slot level above 2nd.
Source: Deep Magic for 5th Edition (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details