60 ft Components:
V, S, M
, up to 1 minute
You create a sword-shaped plane of force that hovers within range. It lasts for the duration.
When the sword appears, you make a melee spell attack against a target of your choice within 5 feet of the sword. On a hit. the target takes 3d10 force damage. Until the spell ends, you can use a bonus action on each of your turns to move the sword up to 20 feet to a spot you can see and repeat this attack against the same target or a different one.
a miniature platinum sword with a grip and pommel of copper and zinc, worth 250gp
Sie Gladius Potentia
Verbal Component (Alternative):
From mystic realms a weapon I source, magic made, a sword of force. Classes:
Combat, DamageSource: Player's Handbook [5th Edition] (page 262)
View Mordenkainen's Sword Spell Card
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Other Planes and Effects
Below is information about this spell as it relates to other planes and area of effects (i.e. underwater). Some of the information is pulled official D&D sources (such as books and the twitter feeds of D&D officials), but other information is derived from forums and online discussions. As always, it is up to the DM to decide how they wish to handle spell effects.
Underwater - Verbal Component
Official rules have been verified by Jeremy Crawford - "No rule prohibits verbal components from working underwater. Keep in mind that if you're talking, you're not holding your breath." Hence, while submerged underwater and holding its breath, a creature can cast a spell that requires a verbal component. After casting the spell, if the creature can't breathe underwater, it immediately runs out of breath. The creature can survive for a number of rounds equal to its Constitution modifier (minimum of 1 round).