Eldritch Sword

Attack: [roll]1d20+5[/roll] Damage: [roll](if([roll:-1:critical], =0, 0, 2{0}.expand()))[/roll]A beam of crackling energy appears in your hand and you teleport toward a creature within range. Make a touch spell attack against the target. On a hit, the target takes 3d20 force damage.

The spell creates more than one blade when you reach higher levels: two blade at 5th level, three blade and you get another astral arm at 11th level, and four blades and another astral arm at 17th level. You can direct the blades at the same target or at different ones. Make a separate attack roll for each blades.