Elemental Saber

This cylindrical hilt conjures a glowing blade that serves as a versatile, light, +2 longsword with finesse. The wielder selects one additional effect:
{r/g} STR saving throw or be pushed 30 feet & knocked prone. Crit range 17-20.
{g} CON saving throw or be restrained.
{w} 5d6 fire damage until it or an ally spends a turn extinguishing the flames.
{u} Acid spray slash. 6d6 in a 15-foot cone. DEX saving for half.