Rankings

Primed Rubedo-Lined Barrel - +187% Damage for Archguns. A significant, if expensive, boost for Archguns.

Primed Cryo Rounds - +165% Cold for Rifles. A significant damage boost for any build using Cold/Cold-combined elements.
Primed Regen - Reduced recovery time and short invulnerability for Sentinels. Useful for increasing Sentinel uptime, but nowhere near as mandatory as it used to be since Sentinels will infinitely auto-revive by default. Additionally, there are a number of mods that can conditionally reduce Sentinel recovery time.
Prisma Grakata - MR11 Full-Auto Rifle. Decent bullet hose with very good Crit and Status Chance but very low base Damage. Suffers notably from powercreep, being quite badly outclassed in the Full-Auto category, particularly by Incarnon weapons.

Prisma Machete - MR7 Machete Melee. Outclassed by the Machete Wraith, among other weapons.
Primed Magazine Warp - +55% Mag Capacity for Rifles. Can be useful on a few weapons, but really struggles to justify the mod slot.
Sands of Inaros - Quest for Inaros. Always in Baro's inventory.
Baro Void-Signal - Key to exclusive mission line, awarding cosmetics. Can only be purchased and played with Inaros Prime. Always in Baro's inventory.

Buzz Kill - +120% Slash for Melee. Niche at best, and Carnis Mandible is usually better anyway. Don't bother buying from Baro, it is a potential drop from the Hydrolyst, and can be bought from other players for quite cheap.

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