Viral Heat is ideal for Grineer, Corrupted and Infested.

MOD BREAKDOWN

• Serrration: gives base damage without requiring kills to build merciless stacks. Amalgam variant gives bonus sprint speed at negligible loss of base dmg. Flexible for Primed Firestorm.
• Galvanized Chamber: Mandatory multishot
• Critical Delay: Mandatory Crit chance
• Vital Sense: Mandatory Crit damage
• [Malignant Force] and [Primed Cryo Rounds]: Gives viral and status chance. Viral status increases all damage to health, 2x at one viral status and 4.25x at 10 viral status.
• Thermite Rounds/[Wildfire]: heat status strips armor up to 50% after 2s (equivalent to a 3.7x dps boost on armor capped enemies) and provides minor heat DoT DPS. Flexible for Primed Firestorm or Primed Bane if there is external armor strip.
• [Vile Acceleration]: Fire rate, flexible for Primed Firestorm if you have external fire rate (e.g. particularly if using Gauss)

Flexible Options

• Primed Bane is optional over serration or thermite rounds, giving a multiplicative 1.55x dmg bonus but at the cost of poor damage ramp up
• [Hammer Shot] and [Bladed Rounds] are alternatives

ARCANE

Primary merciless: provides base damage. Used instead of deadhead due to AOE nature.

VARIANTS

Corpus: Swap [Primed Cryo Rounds] and [Hellfire] for [Hammer Shot] and [Infected Clip] to make pure toxin, which bypasses shields
Murmur: Swap [Primed Cryo Rounds] and [Malignant Force] for [Stormbringer] + [Hammer Shot] to make radiation which many murmur are weak to
Cambion Drift: Swap [Malignant Force] for [Hammer Shot] or [Primed Firestorm] to make pure blast