|A blade somehow crafted from pure electricity. Striking an enemy with it occasionally unleashes a static discharge.|
The Arc Blade is a solid weapon for the early and mid-game. The static discharges are great for controlling crowds and cause only minimal damage to you due to the weapon's electricity resistance. However, you may find it lacking later on.
Be careful of using this weapon near summons, allies, and, if you're a Fedhas worshipper, plants.
Prior to 0.15 it was a +3, +5 weapon.
The arc blade was introduced in 0.14.