Astral Smite

You imbue your weapon with a fraction of cosmic power and a small constellation surrounds the blade. The next time you hit a creature with a weapon attack before this spell ends.The attack deals an extra 2d8 radiant damage to the target. Then you gain temporary hit points equal to half the damage you dealt rounded up, as the constellation sheilds you until the spells ends.

If use cast this spell during the night and you can see stars in the sky, double the temporary hit points you gain from this spell.