Flamestrike
Legend
You need to be proficient in the weapon to use that ability, and it doesn't automatically grant proficiencies. So you are gong to want to be an elf to do that.
Not any more.
Thanks to Weapon proficiency racial swaps, any race that grants a martial weapon or armour proficiency can pick up Longsword as well (via swaps). Hobgoblins, Dwarves, Githyanki off the top of my head.
Or Vuman or Clineage also work via feats (finally a use for the Weapon Master feat!).