XO-16 rounds deal more damage to Shields and drain energy from Vortex and Thermal Shields. Increases ammo capacity.
— Description

Arc Rounds is an upgrade available for the Monarch Titan, on Tier 1 of the Upgrade Core.

When employed, it buffs the Monarch's XO16A2 Chaingun to fire electrified bullets, not too dissimilar to the Amped XO-16 or Burst Core. These buffed rounds will allow Monarch to more effectively fight Titans protected by the shielding of a Battery, and better fight Scorch and Ion due to the Arc Rounds depleting Vortex Shield and Heat Shield much quicker than usual. It will also increase the XO16A2 Chaingun's ammo capacity from 40 to 50.