Flame Blade
You evoke a fiery blade in your free hand. The blade is similar in size and shape to a scimitar, and it lasts for the duration. If you let go of the blade, it disappears, but you can evoke it again as a Bonus Action.
As a Magic action, you can make a melee spell attack with the fiery blade. On a hit, the target takes Fire damage equal to 3d6 plus your spellcasting ability modifier.
The flaming blade sheds Bright Light in a 10-foot radius and Dim Light for an additional 10 feet.
Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 2.
Flame Blade 5e 2024 vs. 2014 edition differences
The 2024 version allows multiple classes (druid, sorcerer) and specifies "up to" 10 minutes duration. It states "as a Magic action" instead of "action" for attack, and adds spellcasting ability modifier to damage. The 2014 version only applies to druids with fixed 3d6 damage and no mention of spellcasting modifier.