Weapon Information
Proboscis Cernos is an enhanced Mutalist Cernos that is Mastery Locked till 15.
The blueprint can be obtained from the Market and then be made at the Foundry.
Proboscis Cernos has 2 Dash Polarity Slots, making the builds in this guide cost 4 Forma.
Advantages
Arrows upon impact release "tendrils" that pull enemies within 9 meters towards the center, exploding 1.7 seconds later in a 7 meter radius.
Has a very high base Status Chance.
The Weapon is Silent....Somehow
Disadvantages
Has very low base Critical Chance and below average Critical Multiplier.
Has an extremely low Ammo Reserve
Explosions inflicts Self-Stagger and has linear damage falloff from 100% to 50% from center impact.
Corpus Build
Element Focus: Magnetic/Radiation/Toxin
Flex Slots: [Serration]

T
Grineer:
Element Focus: Corrosive/Radiation/Heat
Flex Slots: [Serration]

T
Infested:
Element Focus: Heat/Radiation
Flex Slots: [Serration]

T
Orokin
Element Focus: Viral/Magnetic/Heat
Flex Slots: [Serration]

Due to Radiation Resistance we need Magnetic, The weapon seems to just perform poorly in the Steel Path.
Deimos
Element Focus: Gas/Radiation/Electricity
Flex Slots: [Serration]

T
The Murmur
Element Focus: Radiation/Electricity
Flex Slots: [Serration]

T
Narmer Build
Element Focus: Blast/Toxin/Radiation
Flex Slots: [Serration]

T
Scaldra Build
Element Focus: Corrosive/Radiation/Heat
Flex Slots: [Serration]

V
Techrot Build
Element Focus: Gas/Magnetic/Electricity
Flex Slots: [Serration]

T
Mod Slot Flex
Split Chamber - Flex out Galvanized Chamber.
Rifle Aptitude - Flex out Galvanized Aptitude.
Cryo Rounds - Flex out Primed Cryo Rounds.
Bane Mods - Flex out respective Primed counterparts.
Vile Acceleration or Speed Trigger - Flex out build's Flex Slot. Example: Grineer is Serration
Vigilante Armaments or Speed Trigger - Flex out build's Bane Faction Mod, if one doesn't like using Bane mods.
Proboscis Cernos Enhancing
- Damage Enhancement | [Rhino]'s Roar, [Nova]'s Molecular Prime, Mirage's Eclipse, Mesa's Shooting Gallery, Saryn's Toxic Lash, Equinox's Rage, Banshee's Sonar, Chroma's Vex Armor, Cyte-09's Resupply, Garuda's Passive.
Arcane Synergy
Riven Synergy
Ideal Positive Stats - Status Chance, Multishot, Ammo Maximum, Damage, Fire Rate
Ideal Negative Stats - Zoom, Weapon Recoil, Critical Chance(if you get a really good positive roll)
Ending
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