Nulla. Introduction:

This is your default 12x Heavy Corrosive Corufell build (no priming/armor strip).
This is a weapon carried by Condition Overload being multiplicative to base damage bonuses (Pressure Point/Arcane [Fury]) etc. this causes the [Corufell] to be slot starved and will always be starved of at least one stat that is vital to be able to maintain either competitve or comfortable DPS (except for 2x heavy spam). However, despite all these conditions, the weapon is still very strong and should be used for raw damage, heavy attacks instead of relying on DOTs given its slow attack speed and bad stance.

Keeping it just in case it comes back/legacy info (03/08/2023):
[Corufell] has the attribute of being able to gain combo while heavy attacking: if standing far enough (~20m without [Quickening]) AND possesses at least 50% heavy attack efficiency ([Reflex Coil]), projectiles can gain combo if it hits multiple enemies (4+ if you have 90% heavy attack efficiency).

A total of 6 different setups are featured in this guide.

Running Sacrificial Pressure AND Sacrificial Steel WILL need 1 extra forma (regular/umbral)

Video Feature/s:
• 2x Heavy Spam: https://youtu.be/NyK0vHmSBSw
• Levelcap (Utilising Dual Sac & Vicious Frost): https://youtu.be/2SZ3TpK39l4

I. Unlisted Recommendations:

• Primary/Secondary AoE Primer (for [Condition Overload]):
A primer is the term used to describe another weapon (external source) that is allotted to the role of applying multiple status effects before using your primary weapon of DPS. Most melee builds will heavily benefit from not only the viral status effect but also from additional unique statuses since they will be running the mod Conditional Overload resulting in a significant increase of DPS.

II. Flex Slots:

• [Quickening]: if you have an external source that affects melee attack speed (however this is the least important stat as you can still gain combo ~20m away, so more damage is an option)
• [Primed Pressure Point]: if you have an external source that increases melee base dmg bonus
• [Sacrificial Steel]: if you have a critical chance source that is larger than +440% or choosing to run [Condition Overload] (check setups below)
• [Reflex Coil]: (and Focus Energy as well in other setups): if you have an external source of heavy attack efficiency

these include buffs from arcanes/subsumes (helminth)/focus

III. Setups Rundown:

• 1. Heavy [Corrupt Charge] 2x Spam Setup (Corrosive):

Remove: [Reflex Coil], [Focus Energy], [Primed Pressure Point], [Blood Rush] (and [Quickening] if priming)
Substitute: [Shocking Touch] , [Corrupt Charge] (r2), [Killing Blow], [Primed Smite Grineer] (and [Condition Overload] if priming)

• 2. Heavy [Corrupt Charge] 2x Spam Setup (Viral Raw Damage) (Armor Strip):

Remove: [Reflex Coil], [Focus Energy], [Primed Pressure Point], [Blood Rush] (and [Quickening] if priming)
Substitute: [North Wind] , [Corrupt Charge] (r2), [Killing Blow], [Primed Smite Grineer] (and [Condition Overload] if priming)

• 3. [Condition Overload] 12x CORROSIVE Setup (Primer Only):

Remove: [Quickening] (better if you have a source of attack speed e.g. Warcry, Arcane Strike etc.)
Substitute: [Condition Overload]

• 4. Viral Raw Damage 12x (Armor Strip ST):

Remove: [Focus Energy] (and [Quickening] if priming)
Substitute: [North Wind] (and [Condition Overload] if priming)

• 5. Dual Sacrificial 12x Viral Alternative (check calcuations):

Remove: [Focus Energy], [Primed Pressure Point] (and [Quickening] if priming)
Substitute: [Vicious Frost], [Sacrificial Pressure] (and [Condition Overload] if priming)

• 6. Dual Sacrificial 12x Corrosive Alternative (check calcuations):

Remove: [Primed Pressure Point] (and [Quickening] if priming)
Substitute: [Sacrificial Pressure] (and [Condition Overload] if priming)

Calculations at the bottom

IV. Other Factions:

• Corpus/Infested/Corrupted:

2x Combo:
Remove: [Primed Smite Grineer]
Substitute: Respective Primed Smite Faction

12x Combo:
No changes, primed smite mods are not BiS, check rankings below

• Sentient:

2x Combo:
Remove: [Primed Pressure Point], [Blood Rush]
Substitute: [Sacrificial Pressure], [Killing Blow] OR [Condition Overload] (if priming)

12x Combo:
Remove: [Primed Pressure Point]
Substitute: [Sacrificial Pressure]

• Factionless:

2x Combo:
Remove: [Blood Rush]
Substitute: [Killing Blow] OR [Condition Overload] (if priming)

12x Combo:
No Changes OR [Condition Overload] over [Quickening] (if priming)

V. Calculations (%) (Non-Quantised):

• 12x Viral Setups Comparison (Heavy Atk):

[Corufell] Heavy 12x Viral Configs ([Blood Rush] & [Sacrificial Steel]):
Dual Sac + [Vicious Frost]:
(600)x(1+1.375)x(1+0.26x(1+4.4+5.5)x(2.4x(1+0.85)-1))x(1+1.65+0.6) = 49781.121

[Primed Pressure Point] + [North Wind]:
(600)x(1+1.65)x(1+0.26x(1+4.4+4.4)x(2.4x(1+0.85)-1))x(1+1.65+0.9) = 55119.21984

Dual Sac + [North Wind]:
(600)x(1+1.375)x(1+0.26x(1+4.4+5.5)x(2.4x(1+0.85)-1))x(1+1.65+0.9) = 54376.3014

Therefore: [Primed Pressure Point] + [North Wind] is ~1.37% stronger > Dual Sac + [North Wind] which is ~9.23% stronger > Dual Sac + [Vicious Frost].

• Primed Smite Faction vs Sac Steel Comparison:

[Primed Pressure Point] + [North Wind] + [Primed Smite Grineer]
(600)x(1+1.65)x(1+0.26x(1+4.4)x(2.4x(1+0.85)-1))x(1+1.65+0.9)x(1+0.55) = 51004.42449

Therefore: [Sacrificial Steel] + [Blood Rush] Config is ~8.07% stronger > Primed Smite + [Sacrificial Steel].

• Other Rankings (Proving [Sacrificial Steel] + [Blood Rush] > Primed Smite + [Blood Rush]):
Using above 12x combo count, default build.

1. [Primed Pressure Point] + [Sacrificial Steel] + [Blood Rush] = 50461.2576 (which is ~1.37% stronger than 🠓)
2. [Sacrificial Pressure] + [Sacrificial Steel] + [Blood Rush] = 49781.121 (which is ~1.78% stronger than 🠓)
3. [Sacrificial Pressure] + [Sacrificial Steel] + [Primed Smite Grineer] = 48911.00175 (which is ~4.75% stronger than 🠓)
4. [Primed Pressure Point] + [Blood Rush] ([Sacrificial Steel]) + [Primed Smite Grineer] = 46694.19144

• [Gladiator Might] + [Blood Rush] ([Sacrificial Steel]):

Viral 12x Setup:
(600)x(1+1.65)x(1+0.26x(1+4.4+1.1)x(2.4x(1+0.85+0.6)-1))x(1+1.65+0.9) = 47784.906

VI. Log (dd.mm.yyyy):

• 28/02/2023 - build made
• 15/03/2023 - guide update
• 16/03/2023 - recalculations done, primed smite is not BiS
• 03/08/2023 - combo gain ded