Astral Flame Blade

You sheathe a melee weapon in white flame reminiscent of astral space.  If the affected weapon damages a creature with the elemental, fiend or celestial key word, it does 2d8 extra fire damage and ignores resistance to fire.

Any elemental, fiend or celestial damaged cannot regenerate its hit points until its next turn.

The flaming blade sheds dim light in a 5-foot radius.  The astral flame is not hot and cannot set items on fire.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for every two slot levels above 2nd.