Solar Smite is a Spell added by Roots. It is created with the base ingredient, a Sunflower, a Jack o'Lantern and Bone Meal. When cast, hit mobs will be inflicted with 5 + 2 * the potency damage (or 2.5 + the potency hearts). It will deal double the damage for undead mobs (like Skeletons and Zombies), set them on fire, and give them Weakness and Slowness effects.
Runic Tablet entry