Power Sword
A close combat weapon that uses an Elerium Plasma Generator to enhance the blade. It is a very powerful device, but can only be used against adjacent targets.

Power Sword
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A melee weapon of very high damage. It is the strongest non-explosive weapon available. A close combat weapon which recharges slowly. An agent with two swords is extremely deadly. Dual wielded swords can easily dig through a UFO hull or tunnel underground quickly. A common tactic is to use two swords and attack Megaspawns to quickly kill them before they can shoot or launch.
When X-Com is technologically advanced, an agent with two swords, strong armor, personal shields and two teleporters can fight face-to-face against all hostile entities in an uninspiring combat tactic of "appear-stabstab-vanish".
Note: Due to such short range, diagonal 'swings' may impact something due to weapon over-shoot.
Special Note: A power sword is a very-limited-range plasma gun which is shaped like a sword.